diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index dfbe90e3c1..6cee7eb39a 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -24,3 +24,4 @@ src/lib/errors/unsupported-options-iac-error.ts @snyk/cloudconfig
help/commands-docs/iac-examples.md @snyk/cloudconfig
help/commands-docs/iac.md @snyk/cloudconfig
packages/snyk-fix/ @snyk/tech-services
+packages/snyk-protect/ @snyk/hammer
diff --git a/package.json b/package.json
index f599323a82..e6c4e32146 100644
--- a/package.json
+++ b/package.json
@@ -143,10 +143,11 @@
"devDependencies": {
"@types/agent-base": "^4.2.1",
"@types/diff": "^3.5.2",
+ "@types/fs-extra": "^9.0.11",
"@types/jest": "^26.0.20",
"@types/lodash": "^4.14.161",
"@types/needle": "^2.0.4",
- "@types/node": "^10.0.0",
+ "@types/node": "^14.14.31",
"@types/restify": "^8.4.2",
"@types/sarif": "^2.1.2",
"@types/sinon": "^7.5.0",
@@ -155,6 +156,7 @@
"@typescript-eslint/parser": "^2.0.0",
"eslint": "6.8.0",
"eslint-config-prettier": "^6.1.0",
+ "fs-extra": "^9.1.0",
"jest": "^26.6.3",
"lodash": "^4.17.20",
"lodash.countby": "^4.6.0",
diff --git a/packages/snyk-protect/src/lib/index.ts b/packages/snyk-protect/src/lib/index.ts
index 1546634226..d012b81b70 100644
--- a/packages/snyk-protect/src/lib/index.ts
+++ b/packages/snyk-protect/src/lib/index.ts
@@ -9,6 +9,11 @@ import { PhysicalModuleToPatch } from './types';
async function protect(projectFolderPath: string) {
const snykFilePath = path.resolve(projectFolderPath, '.snyk');
+ if (!fs.existsSync(snykFilePath)) {
+ console.log('No .snyk file found');
+ return;
+ }
+
const snykFileContents = fs.readFileSync(snykFilePath, 'utf8');
const snykFilePatchMetadata = extractPatchMetadata(snykFileContents);
diff --git a/packages/snyk-protect/test/acceptance/__snapshots__/protect.spec.ts.snap b/packages/snyk-protect/test/acceptance/__snapshots__/protect.spec.ts.snap
new file mode 100644
index 0000000000..d3b8d8fc5e
--- /dev/null
+++ b/packages/snyk-protect/test/acceptance/__snapshots__/protect.spec.ts.snap
@@ -0,0 +1,51361 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`@snyk/protect applies patch(es) works for project with multiple patchable modules 1`] = `
+"/**
+ * @license
+ * Lodash
+ * Copyright OpenJS Foundation and other contributors
+ * Released under MIT license
+ * Based on Underscore.js 1.8.3
+ * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ */
+;(function() {
+
+ /** Used as a safe reference for \`undefined\` in pre-ES5 environments. */
+ var undefined;
+
+ /** Used as the semantic version number. */
+ var VERSION = '4.17.15';
+
+ /** Used as the size to enable large array optimizations. */
+ var LARGE_ARRAY_SIZE = 200;
+
+ /** Error message constants. */
+ var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
+ FUNC_ERROR_TEXT = 'Expected a function';
+
+ /** Used to stand-in for \`undefined\` hash values. */
+ var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+ /** Used as the maximum memoize cache size. */
+ var MAX_MEMOIZE_SIZE = 500;
+
+ /** Used as the internal argument placeholder. */
+ var PLACEHOLDER = '__lodash_placeholder__';
+
+ /** Used to compose bitmasks for cloning. */
+ var CLONE_DEEP_FLAG = 1,
+ CLONE_FLAT_FLAG = 2,
+ CLONE_SYMBOLS_FLAG = 4;
+
+ /** Used to compose bitmasks for value comparisons. */
+ var COMPARE_PARTIAL_FLAG = 1,
+ COMPARE_UNORDERED_FLAG = 2;
+
+ /** Used to compose bitmasks for function metadata. */
+ var WRAP_BIND_FLAG = 1,
+ WRAP_BIND_KEY_FLAG = 2,
+ WRAP_CURRY_BOUND_FLAG = 4,
+ WRAP_CURRY_FLAG = 8,
+ WRAP_CURRY_RIGHT_FLAG = 16,
+ WRAP_PARTIAL_FLAG = 32,
+ WRAP_PARTIAL_RIGHT_FLAG = 64,
+ WRAP_ARY_FLAG = 128,
+ WRAP_REARG_FLAG = 256,
+ WRAP_FLIP_FLAG = 512;
+
+ /** Used as default options for \`_.truncate\`. */
+ var DEFAULT_TRUNC_LENGTH = 30,
+ DEFAULT_TRUNC_OMISSION = '...';
+
+ /** Used to detect hot functions by number of calls within a span of milliseconds. */
+ var HOT_COUNT = 800,
+ HOT_SPAN = 16;
+
+ /** Used to indicate the type of lazy iteratees. */
+ var LAZY_FILTER_FLAG = 1,
+ LAZY_MAP_FLAG = 2,
+ LAZY_WHILE_FLAG = 3;
+
+ /** Used as references for various \`Number\` constants. */
+ var INFINITY = 1 / 0,
+ MAX_SAFE_INTEGER = 9007199254740991,
+ MAX_INTEGER = 1.7976931348623157e+308,
+ NAN = 0 / 0;
+
+ /** Used as references for the maximum length and index of an array. */
+ var MAX_ARRAY_LENGTH = 4294967295,
+ MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
+ HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
+
+ /** Used to associate wrap methods with their bit flags. */
+ var wrapFlags = [
+ ['ary', WRAP_ARY_FLAG],
+ ['bind', WRAP_BIND_FLAG],
+ ['bindKey', WRAP_BIND_KEY_FLAG],
+ ['curry', WRAP_CURRY_FLAG],
+ ['curryRight', WRAP_CURRY_RIGHT_FLAG],
+ ['flip', WRAP_FLIP_FLAG],
+ ['partial', WRAP_PARTIAL_FLAG],
+ ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
+ ['rearg', WRAP_REARG_FLAG]
+ ];
+
+ /** \`Object#toString\` result references. */
+ var argsTag = '[object Arguments]',
+ arrayTag = '[object Array]',
+ asyncTag = '[object AsyncFunction]',
+ boolTag = '[object Boolean]',
+ dateTag = '[object Date]',
+ domExcTag = '[object DOMException]',
+ errorTag = '[object Error]',
+ funcTag = '[object Function]',
+ genTag = '[object GeneratorFunction]',
+ mapTag = '[object Map]',
+ numberTag = '[object Number]',
+ nullTag = '[object Null]',
+ objectTag = '[object Object]',
+ promiseTag = '[object Promise]',
+ proxyTag = '[object Proxy]',
+ regexpTag = '[object RegExp]',
+ setTag = '[object Set]',
+ stringTag = '[object String]',
+ symbolTag = '[object Symbol]',
+ undefinedTag = '[object Undefined]',
+ weakMapTag = '[object WeakMap]',
+ weakSetTag = '[object WeakSet]';
+
+ var arrayBufferTag = '[object ArrayBuffer]',
+ dataViewTag = '[object DataView]',
+ float32Tag = '[object Float32Array]',
+ float64Tag = '[object Float64Array]',
+ int8Tag = '[object Int8Array]',
+ int16Tag = '[object Int16Array]',
+ int32Tag = '[object Int32Array]',
+ uint8Tag = '[object Uint8Array]',
+ uint8ClampedTag = '[object Uint8ClampedArray]',
+ uint16Tag = '[object Uint16Array]',
+ uint32Tag = '[object Uint32Array]';
+
+ /** Used to match empty string literals in compiled template source. */
+ var reEmptyStringLeading = /\\\\b__p \\\\+= '';/g,
+ reEmptyStringMiddle = /\\\\b(__p \\\\+=) '' \\\\+/g,
+ reEmptyStringTrailing = /(__e\\\\(.*?\\\\)|\\\\b__t\\\\)) \\\\+\\\\n'';/g;
+
+ /** Used to match HTML entities and HTML characters. */
+ var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
+ reUnescapedHtml = /[&<>\\"']/g,
+ reHasEscapedHtml = RegExp(reEscapedHtml.source),
+ reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
+
+ /** Used to match template delimiters. */
+ var reEscape = /<%-([\\\\s\\\\S]+?)%>/g,
+ reEvaluate = /<%([\\\\s\\\\S]+?)%>/g,
+ reInterpolate = /<%=([\\\\s\\\\S]+?)%>/g;
+
+ /** Used to match property names within property paths. */
+ var reIsDeepProp = /\\\\.|\\\\[(?:[^[\\\\]]*|([\\"'])(?:(?!\\\\1)[^\\\\\\\\]|\\\\\\\\.)*?\\\\1)\\\\]/,
+ reIsPlainProp = /^\\\\w*$/,
+ rePropName = /[^.[\\\\]]+|\\\\[(?:(-?\\\\d+(?:\\\\.\\\\d+)?)|([\\"'])((?:(?!\\\\2)[^\\\\\\\\]|\\\\\\\\.)*?)\\\\2)\\\\]|(?=(?:\\\\.|\\\\[\\\\])(?:\\\\.|\\\\[\\\\]|$))/g;
+
+ /**
+ * Used to match \`RegExp\`
+ * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
+ */
+ var reRegExpChar = /[\\\\\\\\^$.*+?()[\\\\]{}|]/g,
+ reHasRegExpChar = RegExp(reRegExpChar.source);
+
+ /** Used to match leading and trailing whitespace. */
+ var reTrim = /^\\\\s+|\\\\s+$/g,
+ reTrimStart = /^\\\\s+/,
+ reTrimEnd = /\\\\s+$/;
+
+ /** Used to match wrap detail comments. */
+ var reWrapComment = /\\\\{(?:\\\\n\\\\/\\\\* \\\\[wrapped with .+\\\\] \\\\*\\\\/)?\\\\n?/,
+ reWrapDetails = /\\\\{\\\\n\\\\/\\\\* \\\\[wrapped with (.+)\\\\] \\\\*/,
+ reSplitDetails = /,? & /;
+
+ /** Used to match words composed of alphanumeric characters. */
+ var reAsciiWord = /[^\\\\x00-\\\\x2f\\\\x3a-\\\\x40\\\\x5b-\\\\x60\\\\x7b-\\\\x7f]+/g;
+
+ /** Used to match backslashes in property paths. */
+ var reEscapeChar = /\\\\\\\\(\\\\\\\\)?/g;
+
+ /**
+ * Used to match
+ * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
+ */
+ var reEsTemplate = /\\\\$\\\\{([^\\\\\\\\}]*(?:\\\\\\\\.[^\\\\\\\\}]*)*)\\\\}/g;
+
+ /** Used to match \`RegExp\` flags from their coerced string values. */
+ var reFlags = /\\\\w*$/;
+
+ /** Used to detect bad signed hexadecimal string values. */
+ var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+
+ /** Used to detect binary string values. */
+ var reIsBinary = /^0b[01]+$/i;
+
+ /** Used to detect host constructors (Safari). */
+ var reIsHostCtor = /^\\\\[object .+?Constructor\\\\]$/;
+
+ /** Used to detect octal string values. */
+ var reIsOctal = /^0o[0-7]+$/i;
+
+ /** Used to detect unsigned integer values. */
+ var reIsUint = /^(?:0|[1-9]\\\\d*)$/;
+
+ /** Used to match Latin Unicode letters (excluding mathematical operators). */
+ var reLatin = /[\\\\xc0-\\\\xd6\\\\xd8-\\\\xf6\\\\xf8-\\\\xff\\\\u0100-\\\\u017f]/g;
+
+ /** Used to ensure capturing order of template delimiters. */
+ var reNoMatch = /($^)/;
+
+ /** Used to match unescaped characters in compiled string literals. */
+ var reUnescapedString = /['\\\\n\\\\r\\\\u2028\\\\u2029\\\\\\\\]/g;
+
+ /** Used to compose unicode character classes. */
+ var rsAstralRange = '\\\\\\\\ud800-\\\\\\\\udfff',
+ rsComboMarksRange = '\\\\\\\\u0300-\\\\\\\\u036f',
+ reComboHalfMarksRange = '\\\\\\\\ufe20-\\\\\\\\ufe2f',
+ rsComboSymbolsRange = '\\\\\\\\u20d0-\\\\\\\\u20ff',
+ rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
+ rsDingbatRange = '\\\\\\\\u2700-\\\\\\\\u27bf',
+ rsLowerRange = 'a-z\\\\\\\\xdf-\\\\\\\\xf6\\\\\\\\xf8-\\\\\\\\xff',
+ rsMathOpRange = '\\\\\\\\xac\\\\\\\\xb1\\\\\\\\xd7\\\\\\\\xf7',
+ rsNonCharRange = '\\\\\\\\x00-\\\\\\\\x2f\\\\\\\\x3a-\\\\\\\\x40\\\\\\\\x5b-\\\\\\\\x60\\\\\\\\x7b-\\\\\\\\xbf',
+ rsPunctuationRange = '\\\\\\\\u2000-\\\\\\\\u206f',
+ rsSpaceRange = ' \\\\\\\\t\\\\\\\\x0b\\\\\\\\f\\\\\\\\xa0\\\\\\\\ufeff\\\\\\\\n\\\\\\\\r\\\\\\\\u2028\\\\\\\\u2029\\\\\\\\u1680\\\\\\\\u180e\\\\\\\\u2000\\\\\\\\u2001\\\\\\\\u2002\\\\\\\\u2003\\\\\\\\u2004\\\\\\\\u2005\\\\\\\\u2006\\\\\\\\u2007\\\\\\\\u2008\\\\\\\\u2009\\\\\\\\u200a\\\\\\\\u202f\\\\\\\\u205f\\\\\\\\u3000',
+ rsUpperRange = 'A-Z\\\\\\\\xc0-\\\\\\\\xd6\\\\\\\\xd8-\\\\\\\\xde',
+ rsVarRange = '\\\\\\\\ufe0e\\\\\\\\ufe0f',
+ rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
+
+ /** Used to compose unicode capture groups. */
+ var rsApos = \\"['\\\\u2019]\\",
+ rsAstral = '[' + rsAstralRange + ']',
+ rsBreak = '[' + rsBreakRange + ']',
+ rsCombo = '[' + rsComboRange + ']',
+ rsDigits = '\\\\\\\\d+',
+ rsDingbat = '[' + rsDingbatRange + ']',
+ rsLower = '[' + rsLowerRange + ']',
+ rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
+ rsFitz = '\\\\\\\\ud83c[\\\\\\\\udffb-\\\\\\\\udfff]',
+ rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
+ rsNonAstral = '[^' + rsAstralRange + ']',
+ rsRegional = '(?:\\\\\\\\ud83c[\\\\\\\\udde6-\\\\\\\\uddff]){2}',
+ rsSurrPair = '[\\\\\\\\ud800-\\\\\\\\udbff][\\\\\\\\udc00-\\\\\\\\udfff]',
+ rsUpper = '[' + rsUpperRange + ']',
+ rsZWJ = '\\\\\\\\u200d';
+
+ /** Used to compose unicode regexes. */
+ var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
+ rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
+ rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
+ rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
+ reOptMod = rsModifier + '?',
+ rsOptVar = '[' + rsVarRange + ']?',
+ rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
+ rsOrdLower = '\\\\\\\\d*(?:1st|2nd|3rd|(?![123])\\\\\\\\dth)(?=\\\\\\\\b|[A-Z_])',
+ rsOrdUpper = '\\\\\\\\d*(?:1ST|2ND|3RD|(?![123])\\\\\\\\dTH)(?=\\\\\\\\b|[a-z_])',
+ rsSeq = rsOptVar + reOptMod + rsOptJoin,
+ rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
+ rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
+
+ /** Used to match apostrophes. */
+ var reApos = RegExp(rsApos, 'g');
+
+ /**
+ * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
+ * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
+ */
+ var reComboMark = RegExp(rsCombo, 'g');
+
+ /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
+ var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
+
+ /** Used to match complex or compound words. */
+ var reUnicodeWord = RegExp([
+ rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
+ rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
+ rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
+ rsUpper + '+' + rsOptContrUpper,
+ rsOrdUpper,
+ rsOrdLower,
+ rsDigits,
+ rsEmoji
+ ].join('|'), 'g');
+
+ /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
+ var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
+
+ /** Used to detect strings that need a more robust regexp to match words. */
+ var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
+
+ /** Used to assign default \`context\` object properties. */
+ var contextProps = [
+ 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
+ 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
+ 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
+ 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
+ '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
+ ];
+
+ /** Used to make template sourceURLs easier to identify. */
+ var templateCounter = -1;
+
+ /** Used to identify \`toStringTag\` values of typed arrays. */
+ var typedArrayTags = {};
+ typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+ typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+ typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+ typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+ typedArrayTags[uint32Tag] = true;
+ typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+ typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+ typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
+ typedArrayTags[errorTag] = typedArrayTags[funcTag] =
+ typedArrayTags[mapTag] = typedArrayTags[numberTag] =
+ typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
+ typedArrayTags[setTag] = typedArrayTags[stringTag] =
+ typedArrayTags[weakMapTag] = false;
+
+ /** Used to identify \`toStringTag\` values supported by \`_.clone\`. */
+ var cloneableTags = {};
+ cloneableTags[argsTag] = cloneableTags[arrayTag] =
+ cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
+ cloneableTags[boolTag] = cloneableTags[dateTag] =
+ cloneableTags[float32Tag] = cloneableTags[float64Tag] =
+ cloneableTags[int8Tag] = cloneableTags[int16Tag] =
+ cloneableTags[int32Tag] = cloneableTags[mapTag] =
+ cloneableTags[numberTag] = cloneableTags[objectTag] =
+ cloneableTags[regexpTag] = cloneableTags[setTag] =
+ cloneableTags[stringTag] = cloneableTags[symbolTag] =
+ cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+ cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+ cloneableTags[errorTag] = cloneableTags[funcTag] =
+ cloneableTags[weakMapTag] = false;
+
+ /** Used to map Latin Unicode letters to basic Latin letters. */
+ var deburredLetters = {
+ // Latin-1 Supplement block.
+ '\\\\xc0': 'A', '\\\\xc1': 'A', '\\\\xc2': 'A', '\\\\xc3': 'A', '\\\\xc4': 'A', '\\\\xc5': 'A',
+ '\\\\xe0': 'a', '\\\\xe1': 'a', '\\\\xe2': 'a', '\\\\xe3': 'a', '\\\\xe4': 'a', '\\\\xe5': 'a',
+ '\\\\xc7': 'C', '\\\\xe7': 'c',
+ '\\\\xd0': 'D', '\\\\xf0': 'd',
+ '\\\\xc8': 'E', '\\\\xc9': 'E', '\\\\xca': 'E', '\\\\xcb': 'E',
+ '\\\\xe8': 'e', '\\\\xe9': 'e', '\\\\xea': 'e', '\\\\xeb': 'e',
+ '\\\\xcc': 'I', '\\\\xcd': 'I', '\\\\xce': 'I', '\\\\xcf': 'I',
+ '\\\\xec': 'i', '\\\\xed': 'i', '\\\\xee': 'i', '\\\\xef': 'i',
+ '\\\\xd1': 'N', '\\\\xf1': 'n',
+ '\\\\xd2': 'O', '\\\\xd3': 'O', '\\\\xd4': 'O', '\\\\xd5': 'O', '\\\\xd6': 'O', '\\\\xd8': 'O',
+ '\\\\xf2': 'o', '\\\\xf3': 'o', '\\\\xf4': 'o', '\\\\xf5': 'o', '\\\\xf6': 'o', '\\\\xf8': 'o',
+ '\\\\xd9': 'U', '\\\\xda': 'U', '\\\\xdb': 'U', '\\\\xdc': 'U',
+ '\\\\xf9': 'u', '\\\\xfa': 'u', '\\\\xfb': 'u', '\\\\xfc': 'u',
+ '\\\\xdd': 'Y', '\\\\xfd': 'y', '\\\\xff': 'y',
+ '\\\\xc6': 'Ae', '\\\\xe6': 'ae',
+ '\\\\xde': 'Th', '\\\\xfe': 'th',
+ '\\\\xdf': 'ss',
+ // Latin Extended-A block.
+ '\\\\u0100': 'A', '\\\\u0102': 'A', '\\\\u0104': 'A',
+ '\\\\u0101': 'a', '\\\\u0103': 'a', '\\\\u0105': 'a',
+ '\\\\u0106': 'C', '\\\\u0108': 'C', '\\\\u010a': 'C', '\\\\u010c': 'C',
+ '\\\\u0107': 'c', '\\\\u0109': 'c', '\\\\u010b': 'c', '\\\\u010d': 'c',
+ '\\\\u010e': 'D', '\\\\u0110': 'D', '\\\\u010f': 'd', '\\\\u0111': 'd',
+ '\\\\u0112': 'E', '\\\\u0114': 'E', '\\\\u0116': 'E', '\\\\u0118': 'E', '\\\\u011a': 'E',
+ '\\\\u0113': 'e', '\\\\u0115': 'e', '\\\\u0117': 'e', '\\\\u0119': 'e', '\\\\u011b': 'e',
+ '\\\\u011c': 'G', '\\\\u011e': 'G', '\\\\u0120': 'G', '\\\\u0122': 'G',
+ '\\\\u011d': 'g', '\\\\u011f': 'g', '\\\\u0121': 'g', '\\\\u0123': 'g',
+ '\\\\u0124': 'H', '\\\\u0126': 'H', '\\\\u0125': 'h', '\\\\u0127': 'h',
+ '\\\\u0128': 'I', '\\\\u012a': 'I', '\\\\u012c': 'I', '\\\\u012e': 'I', '\\\\u0130': 'I',
+ '\\\\u0129': 'i', '\\\\u012b': 'i', '\\\\u012d': 'i', '\\\\u012f': 'i', '\\\\u0131': 'i',
+ '\\\\u0134': 'J', '\\\\u0135': 'j',
+ '\\\\u0136': 'K', '\\\\u0137': 'k', '\\\\u0138': 'k',
+ '\\\\u0139': 'L', '\\\\u013b': 'L', '\\\\u013d': 'L', '\\\\u013f': 'L', '\\\\u0141': 'L',
+ '\\\\u013a': 'l', '\\\\u013c': 'l', '\\\\u013e': 'l', '\\\\u0140': 'l', '\\\\u0142': 'l',
+ '\\\\u0143': 'N', '\\\\u0145': 'N', '\\\\u0147': 'N', '\\\\u014a': 'N',
+ '\\\\u0144': 'n', '\\\\u0146': 'n', '\\\\u0148': 'n', '\\\\u014b': 'n',
+ '\\\\u014c': 'O', '\\\\u014e': 'O', '\\\\u0150': 'O',
+ '\\\\u014d': 'o', '\\\\u014f': 'o', '\\\\u0151': 'o',
+ '\\\\u0154': 'R', '\\\\u0156': 'R', '\\\\u0158': 'R',
+ '\\\\u0155': 'r', '\\\\u0157': 'r', '\\\\u0159': 'r',
+ '\\\\u015a': 'S', '\\\\u015c': 'S', '\\\\u015e': 'S', '\\\\u0160': 'S',
+ '\\\\u015b': 's', '\\\\u015d': 's', '\\\\u015f': 's', '\\\\u0161': 's',
+ '\\\\u0162': 'T', '\\\\u0164': 'T', '\\\\u0166': 'T',
+ '\\\\u0163': 't', '\\\\u0165': 't', '\\\\u0167': 't',
+ '\\\\u0168': 'U', '\\\\u016a': 'U', '\\\\u016c': 'U', '\\\\u016e': 'U', '\\\\u0170': 'U', '\\\\u0172': 'U',
+ '\\\\u0169': 'u', '\\\\u016b': 'u', '\\\\u016d': 'u', '\\\\u016f': 'u', '\\\\u0171': 'u', '\\\\u0173': 'u',
+ '\\\\u0174': 'W', '\\\\u0175': 'w',
+ '\\\\u0176': 'Y', '\\\\u0177': 'y', '\\\\u0178': 'Y',
+ '\\\\u0179': 'Z', '\\\\u017b': 'Z', '\\\\u017d': 'Z',
+ '\\\\u017a': 'z', '\\\\u017c': 'z', '\\\\u017e': 'z',
+ '\\\\u0132': 'IJ', '\\\\u0133': 'ij',
+ '\\\\u0152': 'Oe', '\\\\u0153': 'oe',
+ '\\\\u0149': \\"'n\\", '\\\\u017f': 's'
+ };
+
+ /** Used to map characters to HTML entities. */
+ var htmlEscapes = {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '\\"': '"',
+ \\"'\\": '''
+ };
+
+ /** Used to map HTML entities to characters. */
+ var htmlUnescapes = {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '"': '\\"',
+ ''': \\"'\\"
+ };
+
+ /** Used to escape characters for inclusion in compiled string literals. */
+ var stringEscapes = {
+ '\\\\\\\\': '\\\\\\\\',
+ \\"'\\": \\"'\\",
+ '\\\\n': 'n',
+ '\\\\r': 'r',
+ '\\\\u2028': 'u2028',
+ '\\\\u2029': 'u2029'
+ };
+
+ /** Built-in method references without a dependency on \`root\`. */
+ var freeParseFloat = parseFloat,
+ freeParseInt = parseInt;
+
+ /** Detect free variable \`global\` from Node.js. */
+ var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
+
+ /** Detect free variable \`self\`. */
+ var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
+
+ /** Used as a reference to the global object. */
+ var root = freeGlobal || freeSelf || Function('return this')();
+
+ /** Detect free variable \`exports\`. */
+ var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
+
+ /** Detect free variable \`module\`. */
+ var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
+
+ /** Detect the popular CommonJS extension \`module.exports\`. */
+ var moduleExports = freeModule && freeModule.exports === freeExports;
+
+ /** Detect free variable \`process\` from Node.js. */
+ var freeProcess = moduleExports && freeGlobal.process;
+
+ /** Used to access faster Node.js helpers. */
+ var nodeUtil = (function() {
+ try {
+ // Use \`util.types\` for Node.js 10+.
+ var types = freeModule && freeModule.require && freeModule.require('util').types;
+
+ if (types) {
+ return types;
+ }
+
+ // Legacy \`process.binding('util')\` for Node.js < 10.
+ return freeProcess && freeProcess.binding && freeProcess.binding('util');
+ } catch (e) {}
+ }());
+
+ /* Node.js helper references. */
+ var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
+ nodeIsDate = nodeUtil && nodeUtil.isDate,
+ nodeIsMap = nodeUtil && nodeUtil.isMap,
+ nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
+ nodeIsSet = nodeUtil && nodeUtil.isSet,
+ nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * A faster alternative to \`Function#apply\`, this function invokes \`func\`
+ * with the \`this\` binding of \`thisArg\` and the arguments of \`args\`.
+ *
+ * @private
+ * @param {Function} func The function to invoke.
+ * @param {*} thisArg The \`this\` binding of \`func\`.
+ * @param {Array} args The arguments to invoke \`func\` with.
+ * @returns {*} Returns the result of \`func\`.
+ */
+ function apply(func, thisArg, args) {
+ switch (args.length) {
+ case 0: return func.call(thisArg);
+ case 1: return func.call(thisArg, args[0]);
+ case 2: return func.call(thisArg, args[0], args[1]);
+ case 3: return func.call(thisArg, args[0], args[1], args[2]);
+ }
+ return func.apply(thisArg, args);
+ }
+
+ /**
+ * A specialized version of \`baseAggregator\` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} setter The function to set \`accumulator\` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns \`accumulator\`.
+ */
+ function arrayAggregator(array, setter, iteratee, accumulator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ var value = array[index];
+ setter(accumulator, value, iteratee(value), array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of \`_.forEach\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns \`array\`.
+ */
+ function arrayEach(array, iteratee) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (iteratee(array[index], index, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of \`_.forEachRight\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns \`array\`.
+ */
+ function arrayEachRight(array, iteratee) {
+ var length = array == null ? 0 : array.length;
+
+ while (length--) {
+ if (iteratee(array[length], length, array) === false) {
+ break;
+ }
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of \`_.every\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns \`true\` if all elements pass the predicate check,
+ * else \`false\`.
+ */
+ function arrayEvery(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (!predicate(array[index], index, array)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * A specialized version of \`_.filter\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function arrayFilter(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result[resIndex++] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of \`_.includes\` for arrays without support for
+ * specifying an index to search from.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @returns {boolean} Returns \`true\` if \`target\` is found, else \`false\`.
+ */
+ function arrayIncludes(array, value) {
+ var length = array == null ? 0 : array.length;
+ return !!length && baseIndexOf(array, value, 0) > -1;
+ }
+
+ /**
+ * This function is like \`arrayIncludes\` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {boolean} Returns \`true\` if \`target\` is found, else \`false\`.
+ */
+ function arrayIncludesWith(array, value, comparator) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (comparator(value, array[index])) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of \`_.map\` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function arrayMap(array, iteratee) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = iteratee(array[index], index, array);
+ }
+ return result;
+ }
+
+ /**
+ * Appends the elements of \`values\` to \`array\`.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to append.
+ * @returns {Array} Returns \`array\`.
+ */
+ function arrayPush(array, values) {
+ var index = -1,
+ length = values.length,
+ offset = array.length;
+
+ while (++index < length) {
+ array[offset + index] = values[index];
+ }
+ return array;
+ }
+
+ /**
+ * A specialized version of \`_.reduce\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the first element of \`array\` as
+ * the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduce(array, iteratee, accumulator, initAccum) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ if (initAccum && length) {
+ accumulator = array[++index];
+ }
+ while (++index < length) {
+ accumulator = iteratee(accumulator, array[index], index, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of \`_.reduceRight\` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the last element of \`array\` as
+ * the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+ function arrayReduceRight(array, iteratee, accumulator, initAccum) {
+ var length = array == null ? 0 : array.length;
+ if (initAccum && length) {
+ accumulator = array[--length];
+ }
+ while (length--) {
+ accumulator = iteratee(accumulator, array[length], length, array);
+ }
+ return accumulator;
+ }
+
+ /**
+ * A specialized version of \`_.some\` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns \`true\` if any element passes the predicate check,
+ * else \`false\`.
+ */
+ function arraySome(array, predicate) {
+ var index = -1,
+ length = array == null ? 0 : array.length;
+
+ while (++index < length) {
+ if (predicate(array[index], index, array)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Gets the size of an ASCII \`string\`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+ var asciiSize = baseProperty('length');
+
+ /**
+ * Converts an ASCII \`string\` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function asciiToArray(string) {
+ return string.split('');
+ }
+
+ /**
+ * Splits an ASCII \`string\` into an array of its words.
+ *
+ * @private
+ * @param {string} The string to inspect.
+ * @returns {Array} Returns the words of \`string\`.
+ */
+ function asciiWords(string) {
+ return string.match(reAsciiWord) || [];
+ }
+
+ /**
+ * The base implementation of methods like \`_.findKey\` and \`_.findLastKey\`,
+ * without support for iteratee shorthands, which iterates over \`collection\`
+ * using \`eachFunc\`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {Function} eachFunc The function to iterate over \`collection\`.
+ * @returns {*} Returns the found element or its key, else \`undefined\`.
+ */
+ function baseFindKey(collection, predicate, eachFunc) {
+ var result;
+ eachFunc(collection, function(value, key, collection) {
+ if (predicate(value, key, collection)) {
+ result = key;
+ return false;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.findIndex\` and \`_.findLastIndex\` without
+ * support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {number} fromIndex The index to search from.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function baseFindIndex(array, predicate, fromIndex, fromRight) {
+ var length = array.length,
+ index = fromIndex + (fromRight ? 1 : -1);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (predicate(array[index], index, array)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of \`_.indexOf\` without \`fromIndex\` bounds checks.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function baseIndexOf(array, value, fromIndex) {
+ return value === value
+ ? strictIndexOf(array, value, fromIndex)
+ : baseFindIndex(array, baseIsNaN, fromIndex);
+ }
+
+ /**
+ * This function is like \`baseIndexOf\` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function baseIndexOfWith(array, value, fromIndex, comparator) {
+ var index = fromIndex - 1,
+ length = array.length;
+
+ while (++index < length) {
+ if (comparator(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * The base implementation of \`_.isNaN\` without support for number objects.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is \`NaN\`, else \`false\`.
+ */
+ function baseIsNaN(value) {
+ return value !== value;
+ }
+
+ /**
+ * The base implementation of \`_.mean\` and \`_.meanBy\` without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the mean.
+ */
+ function baseMean(array, iteratee) {
+ var length = array == null ? 0 : array.length;
+ return length ? (baseSum(array, iteratee) / length) : NAN;
+ }
+
+ /**
+ * The base implementation of \`_.property\` without support for deep paths.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function baseProperty(key) {
+ return function(object) {
+ return object == null ? undefined : object[key];
+ };
+ }
+
+ /**
+ * The base implementation of \`_.propertyOf\` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function basePropertyOf(object) {
+ return function(key) {
+ return object == null ? undefined : object[key];
+ };
+ }
+
+ /**
+ * The base implementation of \`_.reduce\` and \`_.reduceRight\`, without support
+ * for iteratee shorthands, which iterates over \`collection\` using \`eachFunc\`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} accumulator The initial value.
+ * @param {boolean} initAccum Specify using the first or last element of
+ * \`collection\` as the initial value.
+ * @param {Function} eachFunc The function to iterate over \`collection\`.
+ * @returns {*} Returns the accumulated value.
+ */
+ function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
+ eachFunc(collection, function(value, index, collection) {
+ accumulator = initAccum
+ ? (initAccum = false, value)
+ : iteratee(accumulator, value, index, collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of \`_.sortBy\` which uses \`comparer\` to define the
+ * sort order of \`array\` and replaces criteria objects with their corresponding
+ * values.
+ *
+ * @private
+ * @param {Array} array The array to sort.
+ * @param {Function} comparer The function to define sort order.
+ * @returns {Array} Returns \`array\`.
+ */
+ function baseSortBy(array, comparer) {
+ var length = array.length;
+
+ array.sort(comparer);
+ while (length--) {
+ array[length] = array[length].value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of \`_.sum\` and \`_.sumBy\` without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {number} Returns the sum.
+ */
+ function baseSum(array, iteratee) {
+ var result,
+ index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ var current = iteratee(array[index]);
+ if (current !== undefined) {
+ result = result === undefined ? current : (result + current);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.times\` without support for iteratee shorthands
+ * or max array length checks.
+ *
+ * @private
+ * @param {number} n The number of times to invoke \`iteratee\`.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the array of results.
+ */
+ function baseTimes(n, iteratee) {
+ var index = -1,
+ result = Array(n);
+
+ while (++index < n) {
+ result[index] = iteratee(index);
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.toPairs\` and \`_.toPairsIn\` which creates an array
+ * of key-value pairs for \`object\` corresponding to the property names of \`props\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} props The property names to get values for.
+ * @returns {Object} Returns the key-value pairs.
+ */
+ function baseToPairs(object, props) {
+ return arrayMap(props, function(key) {
+ return [key, object[key]];
+ });
+ }
+
+ /**
+ * The base implementation of \`_.unary\` without support for storing metadata.
+ *
+ * @private
+ * @param {Function} func The function to cap arguments for.
+ * @returns {Function} Returns the new capped function.
+ */
+ function baseUnary(func) {
+ return function(value) {
+ return func(value);
+ };
+ }
+
+ /**
+ * The base implementation of \`_.values\` and \`_.valuesIn\` which creates an
+ * array of \`object\` property values corresponding to the property names
+ * of \`props\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} props The property names to get values for.
+ * @returns {Object} Returns the array of property values.
+ */
+ function baseValues(object, props) {
+ return arrayMap(props, function(key) {
+ return object[key];
+ });
+ }
+
+ /**
+ * Checks if a \`cache\` value for \`key\` exists.
+ *
+ * @private
+ * @param {Object} cache The cache to query.
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns \`true\` if an entry for \`key\` exists, else \`false\`.
+ */
+ function cacheHas(cache, key) {
+ return cache.has(key);
+ }
+
+ /**
+ * Used by \`_.trim\` and \`_.trimStart\` to get the index of the first string symbol
+ * that is not found in the character symbols.
+ *
+ * @private
+ * @param {Array} strSymbols The string symbols to inspect.
+ * @param {Array} chrSymbols The character symbols to find.
+ * @returns {number} Returns the index of the first unmatched string symbol.
+ */
+ function charsStartIndex(strSymbols, chrSymbols) {
+ var index = -1,
+ length = strSymbols.length;
+
+ while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+ return index;
+ }
+
+ /**
+ * Used by \`_.trim\` and \`_.trimEnd\` to get the index of the last string symbol
+ * that is not found in the character symbols.
+ *
+ * @private
+ * @param {Array} strSymbols The string symbols to inspect.
+ * @param {Array} chrSymbols The character symbols to find.
+ * @returns {number} Returns the index of the last unmatched string symbol.
+ */
+ function charsEndIndex(strSymbols, chrSymbols) {
+ var index = strSymbols.length;
+
+ while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
+ return index;
+ }
+
+ /**
+ * Gets the number of \`placeholder\` occurrences in \`array\`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} placeholder The placeholder to search for.
+ * @returns {number} Returns the placeholder count.
+ */
+ function countHolders(array, placeholder) {
+ var length = array.length,
+ result = 0;
+
+ while (length--) {
+ if (array[length] === placeholder) {
+ ++result;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Used by \`_.deburr\` to convert Latin-1 Supplement and Latin Extended-A
+ * letters to basic Latin letters.
+ *
+ * @private
+ * @param {string} letter The matched letter to deburr.
+ * @returns {string} Returns the deburred letter.
+ */
+ var deburrLetter = basePropertyOf(deburredLetters);
+
+ /**
+ * Used by \`_.escape\` to convert characters to HTML entities.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ var escapeHtmlChar = basePropertyOf(htmlEscapes);
+
+ /**
+ * Used by \`_.template\` to escape characters for inclusion in compiled string literals.
+ *
+ * @private
+ * @param {string} chr The matched character to escape.
+ * @returns {string} Returns the escaped character.
+ */
+ function escapeStringChar(chr) {
+ return '\\\\\\\\' + stringEscapes[chr];
+ }
+
+ /**
+ * Gets the value at \`key\` of \`object\`.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {string} key The key of the property to get.
+ * @returns {*} Returns the property value.
+ */
+ function getValue(object, key) {
+ return object == null ? undefined : object[key];
+ }
+
+ /**
+ * Checks if \`string\` contains Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns \`true\` if a symbol is found, else \`false\`.
+ */
+ function hasUnicode(string) {
+ return reHasUnicode.test(string);
+ }
+
+ /**
+ * Checks if \`string\` contains a word composed of Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns \`true\` if a word is found, else \`false\`.
+ */
+ function hasUnicodeWord(string) {
+ return reHasUnicodeWord.test(string);
+ }
+
+ /**
+ * Converts \`iterator\` to an array.
+ *
+ * @private
+ * @param {Object} iterator The iterator to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function iteratorToArray(iterator) {
+ var data,
+ result = [];
+
+ while (!(data = iterator.next()).done) {
+ result.push(data.value);
+ }
+ return result;
+ }
+
+ /**
+ * Converts \`map\` to its key-value pairs.
+ *
+ * @private
+ * @param {Object} map The map to convert.
+ * @returns {Array} Returns the key-value pairs.
+ */
+ function mapToArray(map) {
+ var index = -1,
+ result = Array(map.size);
+
+ map.forEach(function(value, key) {
+ result[++index] = [key, value];
+ });
+ return result;
+ }
+
+ /**
+ * Creates a unary function that invokes \`func\` with its argument transformed.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {Function} transform The argument transform.
+ * @returns {Function} Returns the new function.
+ */
+ function overArg(func, transform) {
+ return function(arg) {
+ return func(transform(arg));
+ };
+ }
+
+ /**
+ * Replaces all \`placeholder\` elements in \`array\` with an internal placeholder
+ * and returns an array of their indexes.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {*} placeholder The placeholder to replace.
+ * @returns {Array} Returns the new array of placeholder indexes.
+ */
+ function replaceHolders(array, placeholder) {
+ var index = -1,
+ length = array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value === placeholder || value === PLACEHOLDER) {
+ array[index] = PLACEHOLDER;
+ result[resIndex++] = index;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Converts \`set\` to an array of its values.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the values.
+ */
+ function setToArray(set) {
+ var index = -1,
+ result = Array(set.size);
+
+ set.forEach(function(value) {
+ result[++index] = value;
+ });
+ return result;
+ }
+
+ /**
+ * Converts \`set\` to its value-value pairs.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the value-value pairs.
+ */
+ function setToPairs(set) {
+ var index = -1,
+ result = Array(set.size);
+
+ set.forEach(function(value) {
+ result[++index] = [value, value];
+ });
+ return result;
+ }
+
+ /**
+ * A specialized version of \`_.indexOf\` which performs strict equality
+ * comparisons of values, i.e. \`===\`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function strictIndexOf(array, value, fromIndex) {
+ var index = fromIndex - 1,
+ length = array.length;
+
+ while (++index < length) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * A specialized version of \`_.lastIndexOf\` which performs strict equality
+ * comparisons of values, i.e. \`===\`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function strictLastIndexOf(array, value, fromIndex) {
+ var index = fromIndex + 1;
+ while (index--) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return index;
+ }
+
+ /**
+ * Gets the number of symbols in \`string\`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the string size.
+ */
+ function stringSize(string) {
+ return hasUnicode(string)
+ ? unicodeSize(string)
+ : asciiSize(string);
+ }
+
+ /**
+ * Converts \`string\` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function stringToArray(string) {
+ return hasUnicode(string)
+ ? unicodeToArray(string)
+ : asciiToArray(string);
+ }
+
+ /**
+ * Used by \`_.unescape\` to convert HTML entities to characters.
+ *
+ * @private
+ * @param {string} chr The matched character to unescape.
+ * @returns {string} Returns the unescaped character.
+ */
+ var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
+
+ /**
+ * Gets the size of a Unicode \`string\`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+ function unicodeSize(string) {
+ var result = reUnicode.lastIndex = 0;
+ while (reUnicode.test(string)) {
+ ++result;
+ }
+ return result;
+ }
+
+ /**
+ * Converts a Unicode \`string\` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+ function unicodeToArray(string) {
+ return string.match(reUnicode) || [];
+ }
+
+ /**
+ * Splits a Unicode \`string\` into an array of its words.
+ *
+ * @private
+ * @param {string} The string to inspect.
+ * @returns {Array} Returns the words of \`string\`.
+ */
+ function unicodeWords(string) {
+ return string.match(reUnicodeWord) || [];
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Create a new pristine \`lodash\` function using the \`context\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Util
+ * @param {Object} [context=root] The context object.
+ * @returns {Function} Returns a new \`lodash\` function.
+ * @example
+ *
+ * _.mixin({ 'foo': _.constant('foo') });
+ *
+ * var lodash = _.runInContext();
+ * lodash.mixin({ 'bar': lodash.constant('bar') });
+ *
+ * _.isFunction(_.foo);
+ * // => true
+ * _.isFunction(_.bar);
+ * // => false
+ *
+ * lodash.isFunction(lodash.foo);
+ * // => false
+ * lodash.isFunction(lodash.bar);
+ * // => true
+ *
+ * // Create a suped-up \`defer\` in Node.js.
+ * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
+ */
+ var runInContext = (function runInContext(context) {
+ context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
+
+ /** Built-in constructor references. */
+ var Array = context.Array,
+ Date = context.Date,
+ Error = context.Error,
+ Function = context.Function,
+ Math = context.Math,
+ Object = context.Object,
+ RegExp = context.RegExp,
+ String = context.String,
+ TypeError = context.TypeError;
+
+ /** Used for built-in method references. */
+ var arrayProto = Array.prototype,
+ funcProto = Function.prototype,
+ objectProto = Object.prototype;
+
+ /** Used to detect overreaching core-js shims. */
+ var coreJsData = context['__core-js_shared__'];
+
+ /** Used to resolve the decompiled source of functions. */
+ var funcToString = funcProto.toString;
+
+ /** Used to check objects for own properties. */
+ var hasOwnProperty = objectProto.hasOwnProperty;
+
+ /** Used to generate unique IDs. */
+ var idCounter = 0;
+
+ /** Used to detect methods masquerading as native. */
+ var maskSrcKey = (function() {
+ var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
+ return uid ? ('Symbol(src)_1.' + uid) : '';
+ }());
+
+ /**
+ * Used to resolve the
+ * [\`toStringTag\`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+ var nativeObjectToString = objectProto.toString;
+
+ /** Used to infer the \`Object\` constructor. */
+ var objectCtorString = funcToString.call(Object);
+
+ /** Used to restore the original \`_\` reference in \`_.noConflict\`. */
+ var oldDash = root._;
+
+ /** Used to detect if a method is native. */
+ var reIsNative = RegExp('^' +
+ funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\\\\\$&')
+ .replace(/hasOwnProperty|(function).*?(?=\\\\\\\\\\\\()| for .+?(?=\\\\\\\\\\\\])/g, '$1.*?') + '$'
+ );
+
+ /** Built-in value references. */
+ var Buffer = moduleExports ? context.Buffer : undefined,
+ Symbol = context.Symbol,
+ Uint8Array = context.Uint8Array,
+ allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
+ getPrototype = overArg(Object.getPrototypeOf, Object),
+ objectCreate = Object.create,
+ propertyIsEnumerable = objectProto.propertyIsEnumerable,
+ splice = arrayProto.splice,
+ spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
+ symIterator = Symbol ? Symbol.iterator : undefined,
+ symToStringTag = Symbol ? Symbol.toStringTag : undefined;
+
+ var defineProperty = (function() {
+ try {
+ var func = getNative(Object, 'defineProperty');
+ func({}, '', {});
+ return func;
+ } catch (e) {}
+ }());
+
+ /** Mocked built-ins. */
+ var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
+ ctxNow = Date && Date.now !== root.Date.now && Date.now,
+ ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
+
+ /* Built-in method references for those with the same name as other \`lodash\` methods. */
+ var nativeCeil = Math.ceil,
+ nativeFloor = Math.floor,
+ nativeGetSymbols = Object.getOwnPropertySymbols,
+ nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
+ nativeIsFinite = context.isFinite,
+ nativeJoin = arrayProto.join,
+ nativeKeys = overArg(Object.keys, Object),
+ nativeMax = Math.max,
+ nativeMin = Math.min,
+ nativeNow = Date.now,
+ nativeParseInt = context.parseInt,
+ nativeRandom = Math.random,
+ nativeReverse = arrayProto.reverse;
+
+ /* Built-in method references that are verified to be native. */
+ var DataView = getNative(context, 'DataView'),
+ Map = getNative(context, 'Map'),
+ Promise = getNative(context, 'Promise'),
+ Set = getNative(context, 'Set'),
+ WeakMap = getNative(context, 'WeakMap'),
+ nativeCreate = getNative(Object, 'create');
+
+ /** Used to store function metadata. */
+ var metaMap = WeakMap && new WeakMap;
+
+ /** Used to lookup unminified function names. */
+ var realNames = {};
+
+ /** Used to detect maps, sets, and weakmaps. */
+ var dataViewCtorString = toSource(DataView),
+ mapCtorString = toSource(Map),
+ promiseCtorString = toSource(Promise),
+ setCtorString = toSource(Set),
+ weakMapCtorString = toSource(WeakMap);
+
+ /** Used to convert symbols to primitives and strings. */
+ var symbolProto = Symbol ? Symbol.prototype : undefined,
+ symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
+ symbolToString = symbolProto ? symbolProto.toString : undefined;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a \`lodash\` object which wraps \`value\` to enable implicit method
+ * chain sequences. Methods that operate on and return arrays, collections,
+ * and functions can be chained together. Methods that retrieve a single value
+ * or may return a primitive value will automatically end the chain sequence
+ * and return the unwrapped value. Otherwise, the value must be unwrapped
+ * with \`_#value\`.
+ *
+ * Explicit chain sequences, which must be unwrapped with \`_#value\`, may be
+ * enabled using \`_.chain\`.
+ *
+ * The execution of chained methods is lazy, that is, it's deferred until
+ * \`_#value\` is implicitly or explicitly called.
+ *
+ * Lazy evaluation allows several methods to support shortcut fusion.
+ * Shortcut fusion is an optimization to merge iteratee calls; this avoids
+ * the creation of intermediate arrays and can greatly reduce the number of
+ * iteratee executions. Sections of a chain sequence qualify for shortcut
+ * fusion if the section is applied to an array and iteratees accept only
+ * one argument. The heuristic for whether a section qualifies for shortcut
+ * fusion is subject to change.
+ *
+ * Chaining is supported in custom builds as long as the \`_#value\` method is
+ * directly or indirectly included in the build.
+ *
+ * In addition to lodash methods, wrappers have \`Array\` and \`String\` methods.
+ *
+ * The wrapper \`Array\` methods are:
+ * \`concat\`, \`join\`, \`pop\`, \`push\`, \`shift\`, \`sort\`, \`splice\`, and \`unshift\`
+ *
+ * The wrapper \`String\` methods are:
+ * \`replace\` and \`split\`
+ *
+ * The wrapper methods that support shortcut fusion are:
+ * \`at\`, \`compact\`, \`drop\`, \`dropRight\`, \`dropWhile\`, \`filter\`, \`find\`,
+ * \`findLast\`, \`head\`, \`initial\`, \`last\`, \`map\`, \`reject\`, \`reverse\`, \`slice\`,
+ * \`tail\`, \`take\`, \`takeRight\`, \`takeRightWhile\`, \`takeWhile\`, and \`toArray\`
+ *
+ * The chainable wrapper methods are:
+ * \`after\`, \`ary\`, \`assign\`, \`assignIn\`, \`assignInWith\`, \`assignWith\`, \`at\`,
+ * \`before\`, \`bind\`, \`bindAll\`, \`bindKey\`, \`castArray\`, \`chain\`, \`chunk\`,
+ * \`commit\`, \`compact\`, \`concat\`, \`conforms\`, \`constant\`, \`countBy\`, \`create\`,
+ * \`curry\`, \`debounce\`, \`defaults\`, \`defaultsDeep\`, \`defer\`, \`delay\`,
+ * \`difference\`, \`differenceBy\`, \`differenceWith\`, \`drop\`, \`dropRight\`,
+ * \`dropRightWhile\`, \`dropWhile\`, \`extend\`, \`extendWith\`, \`fill\`, \`filter\`,
+ * \`flatMap\`, \`flatMapDeep\`, \`flatMapDepth\`, \`flatten\`, \`flattenDeep\`,
+ * \`flattenDepth\`, \`flip\`, \`flow\`, \`flowRight\`, \`fromPairs\`, \`functions\`,
+ * \`functionsIn\`, \`groupBy\`, \`initial\`, \`intersection\`, \`intersectionBy\`,
+ * \`intersectionWith\`, \`invert\`, \`invertBy\`, \`invokeMap\`, \`iteratee\`, \`keyBy\`,
+ * \`keys\`, \`keysIn\`, \`map\`, \`mapKeys\`, \`mapValues\`, \`matches\`, \`matchesProperty\`,
+ * \`memoize\`, \`merge\`, \`mergeWith\`, \`method\`, \`methodOf\`, \`mixin\`, \`negate\`,
+ * \`nthArg\`, \`omit\`, \`omitBy\`, \`once\`, \`orderBy\`, \`over\`, \`overArgs\`,
+ * \`overEvery\`, \`overSome\`, \`partial\`, \`partialRight\`, \`partition\`, \`pick\`,
+ * \`pickBy\`, \`plant\`, \`property\`, \`propertyOf\`, \`pull\`, \`pullAll\`, \`pullAllBy\`,
+ * \`pullAllWith\`, \`pullAt\`, \`push\`, \`range\`, \`rangeRight\`, \`rearg\`, \`reject\`,
+ * \`remove\`, \`rest\`, \`reverse\`, \`sampleSize\`, \`set\`, \`setWith\`, \`shuffle\`,
+ * \`slice\`, \`sort\`, \`sortBy\`, \`splice\`, \`spread\`, \`tail\`, \`take\`, \`takeRight\`,
+ * \`takeRightWhile\`, \`takeWhile\`, \`tap\`, \`throttle\`, \`thru\`, \`toArray\`,
+ * \`toPairs\`, \`toPairsIn\`, \`toPath\`, \`toPlainObject\`, \`transform\`, \`unary\`,
+ * \`union\`, \`unionBy\`, \`unionWith\`, \`uniq\`, \`uniqBy\`, \`uniqWith\`, \`unset\`,
+ * \`unshift\`, \`unzip\`, \`unzipWith\`, \`update\`, \`updateWith\`, \`values\`,
+ * \`valuesIn\`, \`without\`, \`wrap\`, \`xor\`, \`xorBy\`, \`xorWith\`, \`zip\`,
+ * \`zipObject\`, \`zipObjectDeep\`, and \`zipWith\`
+ *
+ * The wrapper methods that are **not** chainable by default are:
+ * \`add\`, \`attempt\`, \`camelCase\`, \`capitalize\`, \`ceil\`, \`clamp\`, \`clone\`,
+ * \`cloneDeep\`, \`cloneDeepWith\`, \`cloneWith\`, \`conformsTo\`, \`deburr\`,
+ * \`defaultTo\`, \`divide\`, \`each\`, \`eachRight\`, \`endsWith\`, \`eq\`, \`escape\`,
+ * \`escapeRegExp\`, \`every\`, \`find\`, \`findIndex\`, \`findKey\`, \`findLast\`,
+ * \`findLastIndex\`, \`findLastKey\`, \`first\`, \`floor\`, \`forEach\`, \`forEachRight\`,
+ * \`forIn\`, \`forInRight\`, \`forOwn\`, \`forOwnRight\`, \`get\`, \`gt\`, \`gte\`, \`has\`,
+ * \`hasIn\`, \`head\`, \`identity\`, \`includes\`, \`indexOf\`, \`inRange\`, \`invoke\`,
+ * \`isArguments\`, \`isArray\`, \`isArrayBuffer\`, \`isArrayLike\`, \`isArrayLikeObject\`,
+ * \`isBoolean\`, \`isBuffer\`, \`isDate\`, \`isElement\`, \`isEmpty\`, \`isEqual\`,
+ * \`isEqualWith\`, \`isError\`, \`isFinite\`, \`isFunction\`, \`isInteger\`, \`isLength\`,
+ * \`isMap\`, \`isMatch\`, \`isMatchWith\`, \`isNaN\`, \`isNative\`, \`isNil\`, \`isNull\`,
+ * \`isNumber\`, \`isObject\`, \`isObjectLike\`, \`isPlainObject\`, \`isRegExp\`,
+ * \`isSafeInteger\`, \`isSet\`, \`isString\`, \`isUndefined\`, \`isTypedArray\`,
+ * \`isWeakMap\`, \`isWeakSet\`, \`join\`, \`kebabCase\`, \`last\`, \`lastIndexOf\`,
+ * \`lowerCase\`, \`lowerFirst\`, \`lt\`, \`lte\`, \`max\`, \`maxBy\`, \`mean\`, \`meanBy\`,
+ * \`min\`, \`minBy\`, \`multiply\`, \`noConflict\`, \`noop\`, \`now\`, \`nth\`, \`pad\`,
+ * \`padEnd\`, \`padStart\`, \`parseInt\`, \`pop\`, \`random\`, \`reduce\`, \`reduceRight\`,
+ * \`repeat\`, \`result\`, \`round\`, \`runInContext\`, \`sample\`, \`shift\`, \`size\`,
+ * \`snakeCase\`, \`some\`, \`sortedIndex\`, \`sortedIndexBy\`, \`sortedLastIndex\`,
+ * \`sortedLastIndexBy\`, \`startCase\`, \`startsWith\`, \`stubArray\`, \`stubFalse\`,
+ * \`stubObject\`, \`stubString\`, \`stubTrue\`, \`subtract\`, \`sum\`, \`sumBy\`,
+ * \`template\`, \`times\`, \`toFinite\`, \`toInteger\`, \`toJSON\`, \`toLength\`,
+ * \`toLower\`, \`toNumber\`, \`toSafeInteger\`, \`toString\`, \`toUpper\`, \`trim\`,
+ * \`trimEnd\`, \`trimStart\`, \`truncate\`, \`unescape\`, \`uniqueId\`, \`upperCase\`,
+ * \`upperFirst\`, \`value\`, and \`words\`
+ *
+ * @name _
+ * @constructor
+ * @category Seq
+ * @param {*} value The value to wrap in a \`lodash\` instance.
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var wrapped = _([1, 2, 3]);
+ *
+ * // Returns an unwrapped value.
+ * wrapped.reduce(_.add);
+ * // => 6
+ *
+ * // Returns a wrapped value.
+ * var squares = wrapped.map(square);
+ *
+ * _.isArray(squares);
+ * // => false
+ *
+ * _.isArray(squares.value());
+ * // => true
+ */
+ function lodash(value) {
+ if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
+ if (value instanceof LodashWrapper) {
+ return value;
+ }
+ if (hasOwnProperty.call(value, '__wrapped__')) {
+ return wrapperClone(value);
+ }
+ }
+ return new LodashWrapper(value);
+ }
+
+ /**
+ * The base implementation of \`_.create\` without support for assigning
+ * properties to the created object.
+ *
+ * @private
+ * @param {Object} proto The object to inherit from.
+ * @returns {Object} Returns the new object.
+ */
+ var baseCreate = (function() {
+ function object() {}
+ return function(proto) {
+ if (!isObject(proto)) {
+ return {};
+ }
+ if (objectCreate) {
+ return objectCreate(proto);
+ }
+ object.prototype = proto;
+ var result = new object;
+ object.prototype = undefined;
+ return result;
+ };
+ }());
+
+ /**
+ * The function whose prototype chain sequence wrappers inherit from.
+ *
+ * @private
+ */
+ function baseLodash() {
+ // No operation performed.
+ }
+
+ /**
+ * The base constructor for creating \`lodash\` wrapper objects.
+ *
+ * @private
+ * @param {*} value The value to wrap.
+ * @param {boolean} [chainAll] Enable explicit method chain sequences.
+ */
+ function LodashWrapper(value, chainAll) {
+ this.__wrapped__ = value;
+ this.__actions__ = [];
+ this.__chain__ = !!chainAll;
+ this.__index__ = 0;
+ this.__values__ = undefined;
+ }
+
+ /**
+ * By default, the template delimiters used by lodash are like those in
+ * embedded Ruby (ERB) as well as ES2015 template strings. Change the
+ * following template settings to use alternative delimiters.
+ *
+ * @static
+ * @memberOf _
+ * @type {Object}
+ */
+ lodash.templateSettings = {
+
+ /**
+ * Used to detect \`data\` property values to be HTML-escaped.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'escape': reEscape,
+
+ /**
+ * Used to detect code to be evaluated.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'evaluate': reEvaluate,
+
+ /**
+ * Used to detect \`data\` property values to inject.
+ *
+ * @memberOf _.templateSettings
+ * @type {RegExp}
+ */
+ 'interpolate': reInterpolate,
+
+ /**
+ * Used to reference the data object in the template text.
+ *
+ * @memberOf _.templateSettings
+ * @type {string}
+ */
+ 'variable': '',
+
+ /**
+ * Used to import variables into the compiled template.
+ *
+ * @memberOf _.templateSettings
+ * @type {Object}
+ */
+ 'imports': {
+
+ /**
+ * A reference to the \`lodash\` function.
+ *
+ * @memberOf _.templateSettings.imports
+ * @type {Function}
+ */
+ '_': lodash
+ }
+ };
+
+ // Ensure wrappers are instances of \`baseLodash\`.
+ lodash.prototype = baseLodash.prototype;
+ lodash.prototype.constructor = lodash;
+
+ LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+ LodashWrapper.prototype.constructor = LodashWrapper;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a lazy wrapper object which wraps \`value\` to enable lazy evaluation.
+ *
+ * @private
+ * @constructor
+ * @param {*} value The value to wrap.
+ */
+ function LazyWrapper(value) {
+ this.__wrapped__ = value;
+ this.__actions__ = [];
+ this.__dir__ = 1;
+ this.__filtered__ = false;
+ this.__iteratees__ = [];
+ this.__takeCount__ = MAX_ARRAY_LENGTH;
+ this.__views__ = [];
+ }
+
+ /**
+ * Creates a clone of the lazy wrapper object.
+ *
+ * @private
+ * @name clone
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the cloned \`LazyWrapper\` object.
+ */
+ function lazyClone() {
+ var result = new LazyWrapper(this.__wrapped__);
+ result.__actions__ = copyArray(this.__actions__);
+ result.__dir__ = this.__dir__;
+ result.__filtered__ = this.__filtered__;
+ result.__iteratees__ = copyArray(this.__iteratees__);
+ result.__takeCount__ = this.__takeCount__;
+ result.__views__ = copyArray(this.__views__);
+ return result;
+ }
+
+ /**
+ * Reverses the direction of lazy iteration.
+ *
+ * @private
+ * @name reverse
+ * @memberOf LazyWrapper
+ * @returns {Object} Returns the new reversed \`LazyWrapper\` object.
+ */
+ function lazyReverse() {
+ if (this.__filtered__) {
+ var result = new LazyWrapper(this);
+ result.__dir__ = -1;
+ result.__filtered__ = true;
+ } else {
+ result = this.clone();
+ result.__dir__ *= -1;
+ }
+ return result;
+ }
+
+ /**
+ * Extracts the unwrapped value from its lazy wrapper.
+ *
+ * @private
+ * @name value
+ * @memberOf LazyWrapper
+ * @returns {*} Returns the unwrapped value.
+ */
+ function lazyValue() {
+ var array = this.__wrapped__.value(),
+ dir = this.__dir__,
+ isArr = isArray(array),
+ isRight = dir < 0,
+ arrLength = isArr ? array.length : 0,
+ view = getView(0, arrLength, this.__views__),
+ start = view.start,
+ end = view.end,
+ length = end - start,
+ index = isRight ? end : (start - 1),
+ iteratees = this.__iteratees__,
+ iterLength = iteratees.length,
+ resIndex = 0,
+ takeCount = nativeMin(length, this.__takeCount__);
+
+ if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
+ return baseWrapperValue(array, this.__actions__);
+ }
+ var result = [];
+
+ outer:
+ while (length-- && resIndex < takeCount) {
+ index += dir;
+
+ var iterIndex = -1,
+ value = array[index];
+
+ while (++iterIndex < iterLength) {
+ var data = iteratees[iterIndex],
+ iteratee = data.iteratee,
+ type = data.type,
+ computed = iteratee(value);
+
+ if (type == LAZY_MAP_FLAG) {
+ value = computed;
+ } else if (!computed) {
+ if (type == LAZY_FILTER_FLAG) {
+ continue outer;
+ } else {
+ break outer;
+ }
+ }
+ }
+ result[resIndex++] = value;
+ }
+ return result;
+ }
+
+ // Ensure \`LazyWrapper\` is an instance of \`baseLodash\`.
+ LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+ LazyWrapper.prototype.constructor = LazyWrapper;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a hash object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function Hash(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the hash.
+ *
+ * @private
+ * @name clear
+ * @memberOf Hash
+ */
+ function hashClear() {
+ this.__data__ = nativeCreate ? nativeCreate(null) : {};
+ this.size = 0;
+ }
+
+ /**
+ * Removes \`key\` and its value from the hash.
+ *
+ * @private
+ * @name delete
+ * @memberOf Hash
+ * @param {Object} hash The hash to modify.
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns \`true\` if the entry was removed, else \`false\`.
+ */
+ function hashDelete(key) {
+ var result = this.has(key) && delete this.__data__[key];
+ this.size -= result ? 1 : 0;
+ return result;
+ }
+
+ /**
+ * Gets the hash value for \`key\`.
+ *
+ * @private
+ * @name get
+ * @memberOf Hash
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function hashGet(key) {
+ var data = this.__data__;
+ if (nativeCreate) {
+ var result = data[key];
+ return result === HASH_UNDEFINED ? undefined : result;
+ }
+ return hasOwnProperty.call(data, key) ? data[key] : undefined;
+ }
+
+ /**
+ * Checks if a hash value for \`key\` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf Hash
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns \`true\` if an entry for \`key\` exists, else \`false\`.
+ */
+ function hashHas(key) {
+ var data = this.__data__;
+ return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
+ }
+
+ /**
+ * Sets the hash \`key\` to \`value\`.
+ *
+ * @private
+ * @name set
+ * @memberOf Hash
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the hash instance.
+ */
+ function hashSet(key, value) {
+ var data = this.__data__;
+ this.size += this.has(key) ? 0 : 1;
+ data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+ return this;
+ }
+
+ // Add methods to \`Hash\`.
+ Hash.prototype.clear = hashClear;
+ Hash.prototype['delete'] = hashDelete;
+ Hash.prototype.get = hashGet;
+ Hash.prototype.has = hashHas;
+ Hash.prototype.set = hashSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an list cache object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function ListCache(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the list cache.
+ *
+ * @private
+ * @name clear
+ * @memberOf ListCache
+ */
+ function listCacheClear() {
+ this.__data__ = [];
+ this.size = 0;
+ }
+
+ /**
+ * Removes \`key\` and its value from the list cache.
+ *
+ * @private
+ * @name delete
+ * @memberOf ListCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns \`true\` if the entry was removed, else \`false\`.
+ */
+ function listCacheDelete(key) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ if (index < 0) {
+ return false;
+ }
+ var lastIndex = data.length - 1;
+ if (index == lastIndex) {
+ data.pop();
+ } else {
+ splice.call(data, index, 1);
+ }
+ --this.size;
+ return true;
+ }
+
+ /**
+ * Gets the list cache value for \`key\`.
+ *
+ * @private
+ * @name get
+ * @memberOf ListCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function listCacheGet(key) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ return index < 0 ? undefined : data[index][1];
+ }
+
+ /**
+ * Checks if a list cache value for \`key\` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf ListCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns \`true\` if an entry for \`key\` exists, else \`false\`.
+ */
+ function listCacheHas(key) {
+ return assocIndexOf(this.__data__, key) > -1;
+ }
+
+ /**
+ * Sets the list cache \`key\` to \`value\`.
+ *
+ * @private
+ * @name set
+ * @memberOf ListCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the list cache instance.
+ */
+ function listCacheSet(key, value) {
+ var data = this.__data__,
+ index = assocIndexOf(data, key);
+
+ if (index < 0) {
+ ++this.size;
+ data.push([key, value]);
+ } else {
+ data[index][1] = value;
+ }
+ return this;
+ }
+
+ // Add methods to \`ListCache\`.
+ ListCache.prototype.clear = listCacheClear;
+ ListCache.prototype['delete'] = listCacheDelete;
+ ListCache.prototype.get = listCacheGet;
+ ListCache.prototype.has = listCacheHas;
+ ListCache.prototype.set = listCacheSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a map cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function MapCache(entries) {
+ var index = -1,
+ length = entries == null ? 0 : entries.length;
+
+ this.clear();
+ while (++index < length) {
+ var entry = entries[index];
+ this.set(entry[0], entry[1]);
+ }
+ }
+
+ /**
+ * Removes all key-value entries from the map.
+ *
+ * @private
+ * @name clear
+ * @memberOf MapCache
+ */
+ function mapCacheClear() {
+ this.size = 0;
+ this.__data__ = {
+ 'hash': new Hash,
+ 'map': new (Map || ListCache),
+ 'string': new Hash
+ };
+ }
+
+ /**
+ * Removes \`key\` and its value from the map.
+ *
+ * @private
+ * @name delete
+ * @memberOf MapCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns \`true\` if the entry was removed, else \`false\`.
+ */
+ function mapCacheDelete(key) {
+ var result = getMapData(this, key)['delete'](key);
+ this.size -= result ? 1 : 0;
+ return result;
+ }
+
+ /**
+ * Gets the map value for \`key\`.
+ *
+ * @private
+ * @name get
+ * @memberOf MapCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function mapCacheGet(key) {
+ return getMapData(this, key).get(key);
+ }
+
+ /**
+ * Checks if a map value for \`key\` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf MapCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns \`true\` if an entry for \`key\` exists, else \`false\`.
+ */
+ function mapCacheHas(key) {
+ return getMapData(this, key).has(key);
+ }
+
+ /**
+ * Sets the map \`key\` to \`value\`.
+ *
+ * @private
+ * @name set
+ * @memberOf MapCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the map cache instance.
+ */
+ function mapCacheSet(key, value) {
+ var data = getMapData(this, key),
+ size = data.size;
+
+ data.set(key, value);
+ this.size += data.size == size ? 0 : 1;
+ return this;
+ }
+
+ // Add methods to \`MapCache\`.
+ MapCache.prototype.clear = mapCacheClear;
+ MapCache.prototype['delete'] = mapCacheDelete;
+ MapCache.prototype.get = mapCacheGet;
+ MapCache.prototype.has = mapCacheHas;
+ MapCache.prototype.set = mapCacheSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ *
+ * Creates an array cache object to store unique values.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [values] The values to cache.
+ */
+ function SetCache(values) {
+ var index = -1,
+ length = values == null ? 0 : values.length;
+
+ this.__data__ = new MapCache;
+ while (++index < length) {
+ this.add(values[index]);
+ }
+ }
+
+ /**
+ * Adds \`value\` to the array cache.
+ *
+ * @private
+ * @name add
+ * @memberOf SetCache
+ * @alias push
+ * @param {*} value The value to cache.
+ * @returns {Object} Returns the cache instance.
+ */
+ function setCacheAdd(value) {
+ this.__data__.set(value, HASH_UNDEFINED);
+ return this;
+ }
+
+ /**
+ * Checks if \`value\` is in the array cache.
+ *
+ * @private
+ * @name has
+ * @memberOf SetCache
+ * @param {*} value The value to search for.
+ * @returns {number} Returns \`true\` if \`value\` is found, else \`false\`.
+ */
+ function setCacheHas(value) {
+ return this.__data__.has(value);
+ }
+
+ // Add methods to \`SetCache\`.
+ SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
+ SetCache.prototype.has = setCacheHas;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a stack cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+ function Stack(entries) {
+ var data = this.__data__ = new ListCache(entries);
+ this.size = data.size;
+ }
+
+ /**
+ * Removes all key-value entries from the stack.
+ *
+ * @private
+ * @name clear
+ * @memberOf Stack
+ */
+ function stackClear() {
+ this.__data__ = new ListCache;
+ this.size = 0;
+ }
+
+ /**
+ * Removes \`key\` and its value from the stack.
+ *
+ * @private
+ * @name delete
+ * @memberOf Stack
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns \`true\` if the entry was removed, else \`false\`.
+ */
+ function stackDelete(key) {
+ var data = this.__data__,
+ result = data['delete'](key);
+
+ this.size = data.size;
+ return result;
+ }
+
+ /**
+ * Gets the stack value for \`key\`.
+ *
+ * @private
+ * @name get
+ * @memberOf Stack
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+ function stackGet(key) {
+ return this.__data__.get(key);
+ }
+
+ /**
+ * Checks if a stack value for \`key\` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf Stack
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns \`true\` if an entry for \`key\` exists, else \`false\`.
+ */
+ function stackHas(key) {
+ return this.__data__.has(key);
+ }
+
+ /**
+ * Sets the stack \`key\` to \`value\`.
+ *
+ * @private
+ * @name set
+ * @memberOf Stack
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the stack cache instance.
+ */
+ function stackSet(key, value) {
+ var data = this.__data__;
+ if (data instanceof ListCache) {
+ var pairs = data.__data__;
+ if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
+ pairs.push([key, value]);
+ this.size = ++data.size;
+ return this;
+ }
+ data = this.__data__ = new MapCache(pairs);
+ }
+ data.set(key, value);
+ this.size = data.size;
+ return this;
+ }
+
+ // Add methods to \`Stack\`.
+ Stack.prototype.clear = stackClear;
+ Stack.prototype['delete'] = stackDelete;
+ Stack.prototype.get = stackGet;
+ Stack.prototype.has = stackHas;
+ Stack.prototype.set = stackSet;
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of the enumerable property names of the array-like \`value\`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @param {boolean} inherited Specify returning inherited property names.
+ * @returns {Array} Returns the array of property names.
+ */
+ function arrayLikeKeys(value, inherited) {
+ var isArr = isArray(value),
+ isArg = !isArr && isArguments(value),
+ isBuff = !isArr && !isArg && isBuffer(value),
+ isType = !isArr && !isArg && !isBuff && isTypedArray(value),
+ skipIndexes = isArr || isArg || isBuff || isType,
+ result = skipIndexes ? baseTimes(value.length, String) : [],
+ length = result.length;
+
+ for (var key in value) {
+ if ((inherited || hasOwnProperty.call(value, key)) &&
+ !(skipIndexes && (
+ // Safari 9 has enumerable \`arguments.length\` in strict mode.
+ key == 'length' ||
+ // Node.js 0.10 has enumerable non-index properties on buffers.
+ (isBuff && (key == 'offset' || key == 'parent')) ||
+ // PhantomJS 2 has enumerable non-index properties on typed arrays.
+ (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
+ // Skip index properties.
+ isIndex(key, length)
+ ))) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of \`_.sample\` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @returns {*} Returns the random element.
+ */
+ function arraySample(array) {
+ var length = array.length;
+ return length ? array[baseRandom(0, length - 1)] : undefined;
+ }
+
+ /**
+ * A specialized version of \`_.sampleSize\` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+ function arraySampleSize(array, n) {
+ return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
+ }
+
+ /**
+ * A specialized version of \`_.shuffle\` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+ function arrayShuffle(array) {
+ return shuffleSelf(copyArray(array));
+ }
+
+ /**
+ * This function is like \`assignValue\` except that it doesn't assign
+ * \`undefined\` values.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function assignMergeValue(object, key, value) {
+ if ((value !== undefined && !eq(object[key], value)) ||
+ (value === undefined && !(key in object))) {
+ baseAssignValue(object, key, value);
+ }
+ }
+
+ /**
+ * Assigns \`value\` to \`key\` of \`object\` if the existing value is not equivalent
+ * using [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function assignValue(object, key, value) {
+ var objValue = object[key];
+ if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
+ (value === undefined && !(key in object))) {
+ baseAssignValue(object, key, value);
+ }
+ }
+
+ /**
+ * Gets the index at which the \`key\` is found in \`array\` of key-value pairs.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} key The key to search for.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ */
+ function assocIndexOf(array, key) {
+ var length = array.length;
+ while (length--) {
+ if (eq(array[length][0], key)) {
+ return length;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Aggregates elements of \`collection\` on \`accumulator\` with keys transformed
+ * by \`iteratee\` and values set by \`setter\`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set \`accumulator\` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns \`accumulator\`.
+ */
+ function baseAggregator(collection, setter, iteratee, accumulator) {
+ baseEach(collection, function(value, key, collection) {
+ setter(accumulator, value, iteratee(value), collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of \`_.assign\` without support for multiple sources
+ * or \`customizer\` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseAssign(object, source) {
+ return object && copyObject(source, keys(source), object);
+ }
+
+ /**
+ * The base implementation of \`_.assignIn\` without support for multiple sources
+ * or \`customizer\` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseAssignIn(object, source) {
+ return object && copyObject(source, keysIn(source), object);
+ }
+
+ /**
+ * The base implementation of \`assignValue\` and \`assignMergeValue\` without
+ * value checks.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+ function baseAssignValue(object, key, value) {
+ if (key == '__proto__' && defineProperty) {
+ defineProperty(object, key, {
+ 'configurable': true,
+ 'enumerable': true,
+ 'value': value,
+ 'writable': true
+ });
+ } else {
+ object[key] = value;
+ }
+ }
+
+ /**
+ * The base implementation of \`_.at\` without support for individual paths.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {string[]} paths The property paths to pick.
+ * @returns {Array} Returns the picked elements.
+ */
+ function baseAt(object, paths) {
+ var index = -1,
+ length = paths.length,
+ result = Array(length),
+ skip = object == null;
+
+ while (++index < length) {
+ result[index] = skip ? undefined : get(object, paths[index]);
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.clamp\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {number} number The number to clamp.
+ * @param {number} [lower] The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the clamped number.
+ */
+ function baseClamp(number, lower, upper) {
+ if (number === number) {
+ if (upper !== undefined) {
+ number = number <= upper ? number : upper;
+ }
+ if (lower !== undefined) {
+ number = number >= lower ? number : lower;
+ }
+ }
+ return number;
+ }
+
+ /**
+ * The base implementation of \`_.clone\` and \`_.cloneDeep\` which tracks
+ * traversed objects.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {boolean} bitmask The bitmask flags.
+ * 1 - Deep clone
+ * 2 - Flatten inherited properties
+ * 4 - Clone symbols
+ * @param {Function} [customizer] The function to customize cloning.
+ * @param {string} [key] The key of \`value\`.
+ * @param {Object} [object] The parent object of \`value\`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+ function baseClone(value, bitmask, customizer, key, object, stack) {
+ var result,
+ isDeep = bitmask & CLONE_DEEP_FLAG,
+ isFlat = bitmask & CLONE_FLAT_FLAG,
+ isFull = bitmask & CLONE_SYMBOLS_FLAG;
+
+ if (customizer) {
+ result = object ? customizer(value, key, object, stack) : customizer(value);
+ }
+ if (result !== undefined) {
+ return result;
+ }
+ if (!isObject(value)) {
+ return value;
+ }
+ var isArr = isArray(value);
+ if (isArr) {
+ result = initCloneArray(value);
+ if (!isDeep) {
+ return copyArray(value, result);
+ }
+ } else {
+ var tag = getTag(value),
+ isFunc = tag == funcTag || tag == genTag;
+
+ if (isBuffer(value)) {
+ return cloneBuffer(value, isDeep);
+ }
+ if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+ result = (isFlat || isFunc) ? {} : initCloneObject(value);
+ if (!isDeep) {
+ return isFlat
+ ? copySymbolsIn(value, baseAssignIn(result, value))
+ : copySymbols(value, baseAssign(result, value));
+ }
+ } else {
+ if (!cloneableTags[tag]) {
+ return object ? value : {};
+ }
+ result = initCloneByTag(value, tag, isDeep);
+ }
+ }
+ // Check for circular references and return its corresponding clone.
+ stack || (stack = new Stack);
+ var stacked = stack.get(value);
+ if (stacked) {
+ return stacked;
+ }
+ stack.set(value, result);
+
+ if (isSet(value)) {
+ value.forEach(function(subValue) {
+ result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
+ });
+ } else if (isMap(value)) {
+ value.forEach(function(subValue, key) {
+ result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
+ });
+ }
+
+ var keysFunc = isFull
+ ? (isFlat ? getAllKeysIn : getAllKeys)
+ : (isFlat ? keysIn : keys);
+
+ var props = isArr ? undefined : keysFunc(value);
+ arrayEach(props || value, function(subValue, key) {
+ if (props) {
+ key = subValue;
+ subValue = value[key];
+ }
+ // Recursively populate clone (susceptible to call stack limits).
+ assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.conforms\` which doesn't clone \`source\`.
+ *
+ * @private
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseConforms(source) {
+ var props = keys(source);
+ return function(object) {
+ return baseConformsTo(object, source, props);
+ };
+ }
+
+ /**
+ * The base implementation of \`_.conformsTo\` which accepts \`props\` to check.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns \`true\` if \`object\` conforms, else \`false\`.
+ */
+ function baseConformsTo(object, source, props) {
+ var length = props.length;
+ if (object == null) {
+ return !length;
+ }
+ object = Object(object);
+ while (length--) {
+ var key = props[length],
+ predicate = source[key],
+ value = object[key];
+
+ if ((value === undefined && !(key in object)) || !predicate(value)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * The base implementation of \`_.delay\` and \`_.defer\` which accepts \`args\`
+ * to provide to \`func\`.
+ *
+ * @private
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {Array} args The arguments to provide to \`func\`.
+ * @returns {number|Object} Returns the timer id or timeout object.
+ */
+ function baseDelay(func, wait, args) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return setTimeout(function() { func.apply(undefined, args); }, wait);
+ }
+
+ /**
+ * The base implementation of methods like \`_.difference\` without support
+ * for excluding multiple arrays or iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Array} values The values to exclude.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ */
+ function baseDifference(array, values, iteratee, comparator) {
+ var index = -1,
+ includes = arrayIncludes,
+ isCommon = true,
+ length = array.length,
+ result = [],
+ valuesLength = values.length;
+
+ if (!length) {
+ return result;
+ }
+ if (iteratee) {
+ values = arrayMap(values, baseUnary(iteratee));
+ }
+ if (comparator) {
+ includes = arrayIncludesWith;
+ isCommon = false;
+ }
+ else if (values.length >= LARGE_ARRAY_SIZE) {
+ includes = cacheHas;
+ isCommon = false;
+ values = new SetCache(values);
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee == null ? value : iteratee(value);
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (isCommon && computed === computed) {
+ var valuesIndex = valuesLength;
+ while (valuesIndex--) {
+ if (values[valuesIndex] === computed) {
+ continue outer;
+ }
+ }
+ result.push(value);
+ }
+ else if (!includes(values, computed, comparator)) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.forEach\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns \`collection\`.
+ */
+ var baseEach = createBaseEach(baseForOwn);
+
+ /**
+ * The base implementation of \`_.forEachRight\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns \`collection\`.
+ */
+ var baseEachRight = createBaseEach(baseForOwnRight, true);
+
+ /**
+ * The base implementation of \`_.every\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns \`true\` if all elements pass the predicate check,
+ * else \`false\`
+ */
+ function baseEvery(collection, predicate) {
+ var result = true;
+ baseEach(collection, function(value, index, collection) {
+ result = !!predicate(value, index, collection);
+ return result;
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of methods like \`_.max\` and \`_.min\` which accepts a
+ * \`comparator\` to determine the extremum value.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The iteratee invoked per iteration.
+ * @param {Function} comparator The comparator used to compare values.
+ * @returns {*} Returns the extremum value.
+ */
+ function baseExtremum(array, iteratee, comparator) {
+ var index = -1,
+ length = array.length;
+
+ while (++index < length) {
+ var value = array[index],
+ current = iteratee(value);
+
+ if (current != null && (computed === undefined
+ ? (current === current && !isSymbol(current))
+ : comparator(current, computed)
+ )) {
+ var computed = current,
+ result = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.fill\` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill \`array\` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns \`array\`.
+ */
+ function baseFill(array, value, start, end) {
+ var length = array.length;
+
+ start = toInteger(start);
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = (end === undefined || end > length) ? length : toInteger(end);
+ if (end < 0) {
+ end += length;
+ }
+ end = start > end ? 0 : toLength(end);
+ while (start < end) {
+ array[start++] = value;
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of \`_.filter\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ */
+ function baseFilter(collection, predicate) {
+ var result = [];
+ baseEach(collection, function(value, index, collection) {
+ if (predicate(value, index, collection)) {
+ result.push(value);
+ }
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.flatten\` with support for restricting flattening.
+ *
+ * @private
+ * @param {Array} array The array to flatten.
+ * @param {number} depth The maximum recursion depth.
+ * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
+ * @param {boolean} [isStrict] Restrict to values that pass \`predicate\` checks.
+ * @param {Array} [result=[]] The initial result value.
+ * @returns {Array} Returns the new flattened array.
+ */
+ function baseFlatten(array, depth, predicate, isStrict, result) {
+ var index = -1,
+ length = array.length;
+
+ predicate || (predicate = isFlattenable);
+ result || (result = []);
+
+ while (++index < length) {
+ var value = array[index];
+ if (depth > 0 && predicate(value)) {
+ if (depth > 1) {
+ // Recursively flatten arrays (susceptible to call stack limits).
+ baseFlatten(value, depth - 1, predicate, isStrict, result);
+ } else {
+ arrayPush(result, value);
+ }
+ } else if (!isStrict) {
+ result[result.length] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`baseForOwn\` which iterates over \`object\`
+ * properties returned by \`keysFunc\` and invokes \`iteratee\` for each property.
+ * Iteratee functions may exit iteration early by explicitly returning \`false\`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of \`object\`.
+ * @returns {Object} Returns \`object\`.
+ */
+ var baseFor = createBaseFor();
+
+ /**
+ * This function is like \`baseFor\` except that it iterates over properties
+ * in the opposite order.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of \`object\`.
+ * @returns {Object} Returns \`object\`.
+ */
+ var baseForRight = createBaseFor(true);
+
+ /**
+ * The base implementation of \`_.forOwn\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseForOwn(object, iteratee) {
+ return object && baseFor(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of \`_.forOwnRight\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseForOwnRight(object, iteratee) {
+ return object && baseForRight(object, iteratee, keys);
+ }
+
+ /**
+ * The base implementation of \`_.functions\` which creates an array of
+ * \`object\` function property names filtered from \`props\`.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} props The property names to filter.
+ * @returns {Array} Returns the function names.
+ */
+ function baseFunctions(object, props) {
+ return arrayFilter(props, function(key) {
+ return isFunction(object[key]);
+ });
+ }
+
+ /**
+ * The base implementation of \`_.get\` without support for default values.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseGet(object, path) {
+ path = castPath(path, object);
+
+ var index = 0,
+ length = path.length;
+
+ while (object != null && index < length) {
+ object = object[toKey(path[index++])];
+ }
+ return (index && index == length) ? object : undefined;
+ }
+
+ /**
+ * The base implementation of \`getAllKeys\` and \`getAllKeysIn\` which uses
+ * \`keysFunc\` and \`symbolsFunc\` to get the enumerable property names and
+ * symbols of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Function} keysFunc The function to get the keys of \`object\`.
+ * @param {Function} symbolsFunc The function to get the symbols of \`object\`.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function baseGetAllKeys(object, keysFunc, symbolsFunc) {
+ var result = keysFunc(object);
+ return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
+ }
+
+ /**
+ * The base implementation of \`getTag\` without fallbacks for buggy environments.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the \`toStringTag\`.
+ */
+ function baseGetTag(value) {
+ if (value == null) {
+ return value === undefined ? undefinedTag : nullTag;
+ }
+ return (symToStringTag && symToStringTag in Object(value))
+ ? getRawTag(value)
+ : objectToString(value);
+ }
+
+ /**
+ * The base implementation of \`_.gt\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is greater than \`other\`,
+ * else \`false\`.
+ */
+ function baseGt(value, other) {
+ return value > other;
+ }
+
+ /**
+ * The base implementation of \`_.has\` without support for deep paths.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns \`true\` if \`key\` exists, else \`false\`.
+ */
+ function baseHas(object, key) {
+ return object != null && hasOwnProperty.call(object, key);
+ }
+
+ /**
+ * The base implementation of \`_.hasIn\` without support for deep paths.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns \`true\` if \`key\` exists, else \`false\`.
+ */
+ function baseHasIn(object, key) {
+ return object != null && key in Object(object);
+ }
+
+ /**
+ * The base implementation of \`_.inRange\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {number} number The number to check.
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns \`true\` if \`number\` is in the range, else \`false\`.
+ */
+ function baseInRange(number, start, end) {
+ return number >= nativeMin(start, end) && number < nativeMax(start, end);
+ }
+
+ /**
+ * The base implementation of methods like \`_.intersection\`, without support
+ * for iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of shared values.
+ */
+ function baseIntersection(arrays, iteratee, comparator) {
+ var includes = comparator ? arrayIncludesWith : arrayIncludes,
+ length = arrays[0].length,
+ othLength = arrays.length,
+ othIndex = othLength,
+ caches = Array(othLength),
+ maxLength = Infinity,
+ result = [];
+
+ while (othIndex--) {
+ var array = arrays[othIndex];
+ if (othIndex && iteratee) {
+ array = arrayMap(array, baseUnary(iteratee));
+ }
+ maxLength = nativeMin(array.length, maxLength);
+ caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
+ ? new SetCache(othIndex && array)
+ : undefined;
+ }
+ array = arrays[0];
+
+ var index = -1,
+ seen = caches[0];
+
+ outer:
+ while (++index < length && result.length < maxLength) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (!(seen
+ ? cacheHas(seen, computed)
+ : includes(result, computed, comparator)
+ )) {
+ othIndex = othLength;
+ while (--othIndex) {
+ var cache = caches[othIndex];
+ if (!(cache
+ ? cacheHas(cache, computed)
+ : includes(arrays[othIndex], computed, comparator))
+ ) {
+ continue outer;
+ }
+ }
+ if (seen) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.invert\` and \`_.invertBy\` which inverts
+ * \`object\` with values transformed by \`iteratee\` and set by \`setter\`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} setter The function to set \`accumulator\` values.
+ * @param {Function} iteratee The iteratee to transform values.
+ * @param {Object} accumulator The initial inverted object.
+ * @returns {Function} Returns \`accumulator\`.
+ */
+ function baseInverter(object, setter, iteratee, accumulator) {
+ baseForOwn(object, function(value, key, object) {
+ setter(accumulator, iteratee(value), key, object);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The base implementation of \`_.invoke\` without support for individual
+ * method arguments.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {Array} args The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ */
+ function baseInvoke(object, path, args) {
+ path = castPath(path, object);
+ object = parent(object, path);
+ var func = object == null ? object : object[toKey(last(path))];
+ return func == null ? undefined : apply(func, object, args);
+ }
+
+ /**
+ * The base implementation of \`_.isArguments\`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an \`arguments\` object,
+ */
+ function baseIsArguments(value) {
+ return isObjectLike(value) && baseGetTag(value) == argsTag;
+ }
+
+ /**
+ * The base implementation of \`_.isArrayBuffer\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an array buffer, else \`false\`.
+ */
+ function baseIsArrayBuffer(value) {
+ return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
+ }
+
+ /**
+ * The base implementation of \`_.isDate\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a date object, else \`false\`.
+ */
+ function baseIsDate(value) {
+ return isObjectLike(value) && baseGetTag(value) == dateTag;
+ }
+
+ /**
+ * The base implementation of \`_.isEqual\` which supports partial comparisons
+ * and tracks traversed objects.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {boolean} bitmask The bitmask flags.
+ * 1 - Unordered comparison
+ * 2 - Partial comparison
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {Object} [stack] Tracks traversed \`value\` and \`other\` objects.
+ * @returns {boolean} Returns \`true\` if the values are equivalent, else \`false\`.
+ */
+ function baseIsEqual(value, other, bitmask, customizer, stack) {
+ if (value === other) {
+ return true;
+ }
+ if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
+ return value !== value && other !== other;
+ }
+ return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
+ }
+
+ /**
+ * A specialized version of \`baseIsEqual\` for arrays and objects which performs
+ * deep comparisons and tracks traversed objects enabling objects with circular
+ * references to be compared.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {number} bitmask The bitmask flags. See \`baseIsEqual\` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} [stack] Tracks traversed \`object\` and \`other\` objects.
+ * @returns {boolean} Returns \`true\` if the objects are equivalent, else \`false\`.
+ */
+ function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
+ var objIsArr = isArray(object),
+ othIsArr = isArray(other),
+ objTag = objIsArr ? arrayTag : getTag(object),
+ othTag = othIsArr ? arrayTag : getTag(other);
+
+ objTag = objTag == argsTag ? objectTag : objTag;
+ othTag = othTag == argsTag ? objectTag : othTag;
+
+ var objIsObj = objTag == objectTag,
+ othIsObj = othTag == objectTag,
+ isSameTag = objTag == othTag;
+
+ if (isSameTag && isBuffer(object)) {
+ if (!isBuffer(other)) {
+ return false;
+ }
+ objIsArr = true;
+ objIsObj = false;
+ }
+ if (isSameTag && !objIsObj) {
+ stack || (stack = new Stack);
+ return (objIsArr || isTypedArray(object))
+ ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
+ : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
+ }
+ if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
+ var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
+ othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
+
+ if (objIsWrapped || othIsWrapped) {
+ var objUnwrapped = objIsWrapped ? object.value() : object,
+ othUnwrapped = othIsWrapped ? other.value() : other;
+
+ stack || (stack = new Stack);
+ return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
+ }
+ }
+ if (!isSameTag) {
+ return false;
+ }
+ stack || (stack = new Stack);
+ return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
+ }
+
+ /**
+ * The base implementation of \`_.isMap\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a map, else \`false\`.
+ */
+ function baseIsMap(value) {
+ return isObjectLike(value) && getTag(value) == mapTag;
+ }
+
+ /**
+ * The base implementation of \`_.isMatch\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property values to match.
+ * @param {Array} matchData The property names, values, and compare flags to match.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @returns {boolean} Returns \`true\` if \`object\` is a match, else \`false\`.
+ */
+ function baseIsMatch(object, source, matchData, customizer) {
+ var index = matchData.length,
+ length = index,
+ noCustomizer = !customizer;
+
+ if (object == null) {
+ return !length;
+ }
+ object = Object(object);
+ while (index--) {
+ var data = matchData[index];
+ if ((noCustomizer && data[2])
+ ? data[1] !== object[data[0]]
+ : !(data[0] in object)
+ ) {
+ return false;
+ }
+ }
+ while (++index < length) {
+ data = matchData[index];
+ var key = data[0],
+ objValue = object[key],
+ srcValue = data[1];
+
+ if (noCustomizer && data[2]) {
+ if (objValue === undefined && !(key in object)) {
+ return false;
+ }
+ } else {
+ var stack = new Stack;
+ if (customizer) {
+ var result = customizer(objValue, srcValue, key, object, source, stack);
+ }
+ if (!(result === undefined
+ ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
+ : result
+ )) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ /**
+ * The base implementation of \`_.isNative\` without bad shim checks.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a native function,
+ * else \`false\`.
+ */
+ function baseIsNative(value) {
+ if (!isObject(value) || isMasked(value)) {
+ return false;
+ }
+ var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
+ return pattern.test(toSource(value));
+ }
+
+ /**
+ * The base implementation of \`_.isRegExp\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a regexp, else \`false\`.
+ */
+ function baseIsRegExp(value) {
+ return isObjectLike(value) && baseGetTag(value) == regexpTag;
+ }
+
+ /**
+ * The base implementation of \`_.isSet\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a set, else \`false\`.
+ */
+ function baseIsSet(value) {
+ return isObjectLike(value) && getTag(value) == setTag;
+ }
+
+ /**
+ * The base implementation of \`_.isTypedArray\` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a typed array, else \`false\`.
+ */
+ function baseIsTypedArray(value) {
+ return isObjectLike(value) &&
+ isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
+ }
+
+ /**
+ * The base implementation of \`_.iteratee\`.
+ *
+ * @private
+ * @param {*} [value=_.identity] The value to convert to an iteratee.
+ * @returns {Function} Returns the iteratee.
+ */
+ function baseIteratee(value) {
+ // Don't store the \`typeof\` result in a variable to avoid a JIT bug in Safari 9.
+ // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
+ if (typeof value == 'function') {
+ return value;
+ }
+ if (value == null) {
+ return identity;
+ }
+ if (typeof value == 'object') {
+ return isArray(value)
+ ? baseMatchesProperty(value[0], value[1])
+ : baseMatches(value);
+ }
+ return property(value);
+ }
+
+ /**
+ * The base implementation of \`_.keys\` which doesn't treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function baseKeys(object) {
+ if (!isPrototype(object)) {
+ return nativeKeys(object);
+ }
+ var result = [];
+ for (var key in Object(object)) {
+ if (hasOwnProperty.call(object, key) && key != 'constructor') {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.keysIn\` which doesn't treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function baseKeysIn(object) {
+ if (!isObject(object)) {
+ return nativeKeysIn(object);
+ }
+ var isProto = isPrototype(object),
+ result = [];
+
+ for (var key in object) {
+ if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.lt\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is less than \`other\`,
+ * else \`false\`.
+ */
+ function baseLt(value, other) {
+ return value < other;
+ }
+
+ /**
+ * The base implementation of \`_.map\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ */
+ function baseMap(collection, iteratee) {
+ var index = -1,
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value, key, collection) {
+ result[++index] = iteratee(value, key, collection);
+ });
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.matches\` which doesn't clone \`source\`.
+ *
+ * @private
+ * @param {Object} source The object of property values to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseMatches(source) {
+ var matchData = getMatchData(source);
+ if (matchData.length == 1 && matchData[0][2]) {
+ return matchesStrictComparable(matchData[0][0], matchData[0][1]);
+ }
+ return function(object) {
+ return object === source || baseIsMatch(object, source, matchData);
+ };
+ }
+
+ /**
+ * The base implementation of \`_.matchesProperty\` which doesn't clone \`srcValue\`.
+ *
+ * @private
+ * @param {string} path The path of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function baseMatchesProperty(path, srcValue) {
+ if (isKey(path) && isStrictComparable(srcValue)) {
+ return matchesStrictComparable(toKey(path), srcValue);
+ }
+ return function(object) {
+ var objValue = get(object, path);
+ return (objValue === undefined && objValue === srcValue)
+ ? hasIn(object, path)
+ : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
+ };
+ }
+
+ /**
+ * The base implementation of \`_.merge\` without support for multiple sources.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {number} srcIndex The index of \`source\`.
+ * @param {Function} [customizer] The function to customize merged values.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ */
+ function baseMerge(object, source, srcIndex, customizer, stack) {
+ if (object === source) {
+ return;
+ }
+ baseFor(source, function(srcValue, key) {
+ stack || (stack = new Stack);
+ if (isObject(srcValue)) {
+ baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
+ }
+ else {
+ var newValue = customizer
+ ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
+ : undefined;
+
+ if (newValue === undefined) {
+ newValue = srcValue;
+ }
+ assignMergeValue(object, key, newValue);
+ }
+ }, keysIn);
+ }
+
+ /**
+ * A specialized version of \`baseMerge\` for arrays and objects which performs
+ * deep merges and tracks traversed objects enabling objects with circular
+ * references to be merged.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {string} key The key of the value to merge.
+ * @param {number} srcIndex The index of \`source\`.
+ * @param {Function} mergeFunc The function to merge values.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ */
+ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
+ var objValue = safeGet(object, key),
+ srcValue = safeGet(source, key),
+ stacked = stack.get(srcValue);
+
+ if (stacked) {
+ assignMergeValue(object, key, stacked);
+ return;
+ }
+ var newValue = customizer
+ ? customizer(objValue, srcValue, (key + ''), object, source, stack)
+ : undefined;
+
+ var isCommon = newValue === undefined;
+
+ if (isCommon) {
+ var isArr = isArray(srcValue),
+ isBuff = !isArr && isBuffer(srcValue),
+ isTyped = !isArr && !isBuff && isTypedArray(srcValue);
+
+ newValue = srcValue;
+ if (isArr || isBuff || isTyped) {
+ if (isArray(objValue)) {
+ newValue = objValue;
+ }
+ else if (isArrayLikeObject(objValue)) {
+ newValue = copyArray(objValue);
+ }
+ else if (isBuff) {
+ isCommon = false;
+ newValue = cloneBuffer(srcValue, true);
+ }
+ else if (isTyped) {
+ isCommon = false;
+ newValue = cloneTypedArray(srcValue, true);
+ }
+ else {
+ newValue = [];
+ }
+ }
+ else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+ newValue = objValue;
+ if (isArguments(objValue)) {
+ newValue = toPlainObject(objValue);
+ }
+ else if (!isObject(objValue) || isFunction(objValue)) {
+ newValue = initCloneObject(srcValue);
+ }
+ }
+ else {
+ isCommon = false;
+ }
+ }
+ if (isCommon) {
+ // Recursively merge objects and arrays (susceptible to call stack limits).
+ stack.set(srcValue, newValue);
+ mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+ stack['delete'](srcValue);
+ }
+ assignMergeValue(object, key, newValue);
+ }
+
+ /**
+ * The base implementation of \`_.nth\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {number} n The index of the element to return.
+ * @returns {*} Returns the nth element of \`array\`.
+ */
+ function baseNth(array, n) {
+ var length = array.length;
+ if (!length) {
+ return;
+ }
+ n += n < 0 ? length : 0;
+ return isIndex(n, length) ? array[n] : undefined;
+ }
+
+ /**
+ * The base implementation of \`_.orderBy\` without param guards.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+ * @param {string[]} orders The sort orders of \`iteratees\`.
+ * @returns {Array} Returns the new sorted array.
+ */
+ function baseOrderBy(collection, iteratees, orders) {
+ var index = -1;
+ iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee()));
+
+ var result = baseMap(collection, function(value, key, collection) {
+ var criteria = arrayMap(iteratees, function(iteratee) {
+ return iteratee(value);
+ });
+ return { 'criteria': criteria, 'index': ++index, 'value': value };
+ });
+
+ return baseSortBy(result, function(object, other) {
+ return compareMultiple(object, other, orders);
+ });
+ }
+
+ /**
+ * The base implementation of \`_.pick\` without support for individual
+ * property identifiers.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} paths The property paths to pick.
+ * @returns {Object} Returns the new object.
+ */
+ function basePick(object, paths) {
+ return basePickBy(object, paths, function(value, path) {
+ return hasIn(object, path);
+ });
+ }
+
+ /**
+ * The base implementation of \`_.pickBy\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} paths The property paths to pick.
+ * @param {Function} predicate The function invoked per property.
+ * @returns {Object} Returns the new object.
+ */
+ function basePickBy(object, paths, predicate) {
+ var index = -1,
+ length = paths.length,
+ result = {};
+
+ while (++index < length) {
+ var path = paths[index],
+ value = baseGet(object, path);
+
+ if (predicate(value, path)) {
+ baseSet(result, castPath(path, object), value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * A specialized version of \`baseProperty\` which supports deep paths.
+ *
+ * @private
+ * @param {Array|string} path The path of the property to get.
+ * @returns {Function} Returns the new accessor function.
+ */
+ function basePropertyDeep(path) {
+ return function(object) {
+ return baseGet(object, path);
+ };
+ }
+
+ /**
+ * The base implementation of \`_.pullAllBy\` without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns \`array\`.
+ */
+ function basePullAll(array, values, iteratee, comparator) {
+ var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
+ index = -1,
+ length = values.length,
+ seen = array;
+
+ if (array === values) {
+ values = copyArray(values);
+ }
+ if (iteratee) {
+ seen = arrayMap(array, baseUnary(iteratee));
+ }
+ while (++index < length) {
+ var fromIndex = 0,
+ value = values[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
+ if (seen !== array) {
+ splice.call(seen, fromIndex, 1);
+ }
+ splice.call(array, fromIndex, 1);
+ }
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of \`_.pullAt\` without support for individual
+ * indexes or capturing the removed elements.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {number[]} indexes The indexes of elements to remove.
+ * @returns {Array} Returns \`array\`.
+ */
+ function basePullAt(array, indexes) {
+ var length = array ? indexes.length : 0,
+ lastIndex = length - 1;
+
+ while (length--) {
+ var index = indexes[length];
+ if (length == lastIndex || index !== previous) {
+ var previous = index;
+ if (isIndex(index)) {
+ splice.call(array, index, 1);
+ } else {
+ baseUnset(array, index);
+ }
+ }
+ }
+ return array;
+ }
+
+ /**
+ * The base implementation of \`_.random\` without support for returning
+ * floating-point numbers.
+ *
+ * @private
+ * @param {number} lower The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the random number.
+ */
+ function baseRandom(lower, upper) {
+ return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
+ }
+
+ /**
+ * The base implementation of \`_.range\` and \`_.rangeRight\` which doesn't
+ * coerce arguments.
+ *
+ * @private
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @param {number} step The value to increment or decrement by.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the range of numbers.
+ */
+ function baseRange(start, end, step, fromRight) {
+ var index = -1,
+ length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+ result = Array(length);
+
+ while (length--) {
+ result[fromRight ? length : ++index] = start;
+ start += step;
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.repeat\` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {string} string The string to repeat.
+ * @param {number} n The number of times to repeat the string.
+ * @returns {string} Returns the repeated string.
+ */
+ function baseRepeat(string, n) {
+ var result = '';
+ if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
+ return result;
+ }
+ // Leverage the exponentiation by squaring algorithm for a faster repeat.
+ // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
+ do {
+ if (n % 2) {
+ result += string;
+ }
+ n = nativeFloor(n / 2);
+ if (n) {
+ string += string;
+ }
+ } while (n);
+
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.rest\` which doesn't validate or coerce arguments.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ */
+ function baseRest(func, start) {
+ return setToString(overRest(func, start, identity), func + '');
+ }
+
+ /**
+ * The base implementation of \`_.sample\`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to sample.
+ * @returns {*} Returns the random element.
+ */
+ function baseSample(collection) {
+ return arraySample(values(collection));
+ }
+
+ /**
+ * The base implementation of \`_.sampleSize\` without param guards.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+ function baseSampleSize(collection, n) {
+ var array = values(collection);
+ return shuffleSelf(array, baseClamp(n, 0, array.length));
+ }
+
+ /**
+ * The base implementation of \`_.set\`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseSet(object, path, value, customizer) {
+ if (!isObject(object)) {
+ return object;
+ }
+ path = castPath(path, object);
+
+ var index = -1,
+ length = path.length,
+ lastIndex = length - 1,
+ nested = object;
+
+ while (nested != null && ++index < length) {
+ var key = toKey(path[index]),
+ newValue = value;
+
+ if ((key === '__proto__' || key === 'constructor' || key === 'prototype')) {
+ return object;
+ }
+
+ if (index != lastIndex) {
+ var objValue = nested[key];
+ newValue = customizer ? customizer(objValue, key, nested) : undefined;
+ if (newValue === undefined) {
+ newValue = isObject(objValue)
+ ? objValue
+ : (isIndex(path[index + 1]) ? [] : {});
+ }
+ }
+ assignValue(nested, key, newValue);
+ nested = nested[key];
+ }
+ return object;
+ }
+
+ /**
+ * The base implementation of \`setData\` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns \`func\`.
+ */
+ var baseSetData = !metaMap ? identity : function(func, data) {
+ metaMap.set(func, data);
+ return func;
+ };
+
+ /**
+ * The base implementation of \`setToString\` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The \`toString\` result.
+ * @returns {Function} Returns \`func\`.
+ */
+ var baseSetToString = !defineProperty ? identity : function(func, string) {
+ return defineProperty(func, 'toString', {
+ 'configurable': true,
+ 'enumerable': false,
+ 'value': constant(string),
+ 'writable': true
+ });
+ };
+
+ /**
+ * The base implementation of \`_.shuffle\`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+ function baseShuffle(collection) {
+ return shuffleSelf(values(collection));
+ }
+
+ /**
+ * The base implementation of \`_.slice\` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of \`array\`.
+ */
+ function baseSlice(array, start, end) {
+ var index = -1,
+ length = array.length;
+
+ if (start < 0) {
+ start = -start > length ? 0 : (length + start);
+ }
+ end = end > length ? length : end;
+ if (end < 0) {
+ end += length;
+ }
+ length = start > end ? 0 : ((end - start) >>> 0);
+ start >>>= 0;
+
+ var result = Array(length);
+ while (++index < length) {
+ result[index] = array[index + start];
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.some\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns \`true\` if any element passes the predicate check,
+ * else \`false\`.
+ */
+ function baseSome(collection, predicate) {
+ var result;
+
+ baseEach(collection, function(value, index, collection) {
+ result = predicate(value, index, collection);
+ return !result;
+ });
+ return !!result;
+ }
+
+ /**
+ * The base implementation of \`_.sortedIndex\` and \`_.sortedLastIndex\` which
+ * performs a binary search of \`array\` to determine the index at which \`value\`
+ * should be inserted into \`array\` in order to maintain its sort order.
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ */
+ function baseSortedIndex(array, value, retHighest) {
+ var low = 0,
+ high = array == null ? low : array.length;
+
+ if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
+ while (low < high) {
+ var mid = (low + high) >>> 1,
+ computed = array[mid];
+
+ if (computed !== null && !isSymbol(computed) &&
+ (retHighest ? (computed <= value) : (computed < value))) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return high;
+ }
+ return baseSortedIndexBy(array, value, identity, retHighest);
+ }
+
+ /**
+ * The base implementation of \`_.sortedIndexBy\` and \`_.sortedLastIndexBy\`
+ * which invokes \`iteratee\` for \`value\` and each element of \`array\` to compute
+ * their sort ranking. The iteratee is invoked with one argument; (value).
+ *
+ * @private
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} iteratee The iteratee invoked per element.
+ * @param {boolean} [retHighest] Specify returning the highest qualified index.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ */
+ function baseSortedIndexBy(array, value, iteratee, retHighest) {
+ value = iteratee(value);
+
+ var low = 0,
+ high = array == null ? 0 : array.length,
+ valIsNaN = value !== value,
+ valIsNull = value === null,
+ valIsSymbol = isSymbol(value),
+ valIsUndefined = value === undefined;
+
+ while (low < high) {
+ var mid = nativeFloor((low + high) / 2),
+ computed = iteratee(array[mid]),
+ othIsDefined = computed !== undefined,
+ othIsNull = computed === null,
+ othIsReflexive = computed === computed,
+ othIsSymbol = isSymbol(computed);
+
+ if (valIsNaN) {
+ var setLow = retHighest || othIsReflexive;
+ } else if (valIsUndefined) {
+ setLow = othIsReflexive && (retHighest || othIsDefined);
+ } else if (valIsNull) {
+ setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
+ } else if (valIsSymbol) {
+ setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
+ } else if (othIsNull || othIsSymbol) {
+ setLow = false;
+ } else {
+ setLow = retHighest ? (computed <= value) : (computed < value);
+ }
+ if (setLow) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return nativeMin(high, MAX_ARRAY_INDEX);
+ }
+
+ /**
+ * The base implementation of \`_.sortedUniq\` and \`_.sortedUniqBy\` without
+ * support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+ function baseSortedUniq(array, iteratee) {
+ var index = -1,
+ length = array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ if (!index || !eq(computed, seen)) {
+ var seen = computed;
+ result[resIndex++] = value === 0 ? 0 : value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.toNumber\` which doesn't ensure correct
+ * conversions of binary, hexadecimal, or octal string values.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {number} Returns the number.
+ */
+ function baseToNumber(value) {
+ if (typeof value == 'number') {
+ return value;
+ }
+ if (isSymbol(value)) {
+ return NAN;
+ }
+ return +value;
+ }
+
+ /**
+ * The base implementation of \`_.toString\` which doesn't convert nullish
+ * values to empty strings.
+ *
+ * @private
+ * @param {*} value The value to process.
+ * @returns {string} Returns the string.
+ */
+ function baseToString(value) {
+ // Exit early for strings to avoid a performance hit in some environments.
+ if (typeof value == 'string') {
+ return value;
+ }
+ if (isArray(value)) {
+ // Recursively convert values (susceptible to call stack limits).
+ return arrayMap(value, baseToString) + '';
+ }
+ if (isSymbol(value)) {
+ return symbolToString ? symbolToString.call(value) : '';
+ }
+ var result = (value + '');
+ return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+ }
+
+ /**
+ * The base implementation of \`_.uniqBy\` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ */
+ function baseUniq(array, iteratee, comparator) {
+ var index = -1,
+ includes = arrayIncludes,
+ length = array.length,
+ isCommon = true,
+ result = [],
+ seen = result;
+
+ if (comparator) {
+ isCommon = false;
+ includes = arrayIncludesWith;
+ }
+ else if (length >= LARGE_ARRAY_SIZE) {
+ var set = iteratee ? null : createSet(array);
+ if (set) {
+ return setToArray(set);
+ }
+ isCommon = false;
+ includes = cacheHas;
+ seen = new SetCache;
+ }
+ else {
+ seen = iteratee ? [] : result;
+ }
+ outer:
+ while (++index < length) {
+ var value = array[index],
+ computed = iteratee ? iteratee(value) : value;
+
+ value = (comparator || value !== 0) ? value : 0;
+ if (isCommon && computed === computed) {
+ var seenIndex = seen.length;
+ while (seenIndex--) {
+ if (seen[seenIndex] === computed) {
+ continue outer;
+ }
+ }
+ if (iteratee) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ else if (!includes(seen, computed, comparator)) {
+ if (seen !== result) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * The base implementation of \`_.unset\`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The property path to unset.
+ * @returns {boolean} Returns \`true\` if the property is deleted, else \`false\`.
+ */
+ function baseUnset(object, path) {
+ path = castPath(path, object);
+ object = parent(object, path);
+ return object == null || delete object[toKey(last(path))];
+ }
+
+ /**
+ * The base implementation of \`_.update\`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to update.
+ * @param {Function} updater The function to produce the updated value.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns \`object\`.
+ */
+ function baseUpdate(object, path, updater, customizer) {
+ return baseSet(object, path, updater(baseGet(object, path)), customizer);
+ }
+
+ /**
+ * The base implementation of methods like \`_.dropWhile\` and \`_.takeWhile\`
+ * without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the slice of \`array\`.
+ */
+ function baseWhile(array, predicate, isDrop, fromRight) {
+ var length = array.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length) &&
+ predicate(array[index], index, array)) {}
+
+ return isDrop
+ ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
+ : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
+ }
+
+ /**
+ * The base implementation of \`wrapperValue\` which returns the result of
+ * performing a sequence of actions on the unwrapped \`value\`, where each
+ * successive action is supplied the return value of the previous.
+ *
+ * @private
+ * @param {*} value The unwrapped value.
+ * @param {Array} actions Actions to perform to resolve the unwrapped value.
+ * @returns {*} Returns the resolved value.
+ */
+ function baseWrapperValue(value, actions) {
+ var result = value;
+ if (result instanceof LazyWrapper) {
+ result = result.value();
+ }
+ return arrayReduce(actions, function(result, action) {
+ return action.func.apply(action.thisArg, arrayPush([result], action.args));
+ }, result);
+ }
+
+ /**
+ * The base implementation of methods like \`_.xor\`, without support for
+ * iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of values.
+ */
+ function baseXor(arrays, iteratee, comparator) {
+ var length = arrays.length;
+ if (length < 2) {
+ return length ? baseUniq(arrays[0]) : [];
+ }
+ var index = -1,
+ result = Array(length);
+
+ while (++index < length) {
+ var array = arrays[index],
+ othIndex = -1;
+
+ while (++othIndex < length) {
+ if (othIndex != index) {
+ result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
+ }
+ }
+ }
+ return baseUniq(baseFlatten(result, 1), iteratee, comparator);
+ }
+
+ /**
+ * This base implementation of \`_.zipObject\` which assigns values using \`assignFunc\`.
+ *
+ * @private
+ * @param {Array} props The property identifiers.
+ * @param {Array} values The property values.
+ * @param {Function} assignFunc The function to assign values.
+ * @returns {Object} Returns the new object.
+ */
+ function baseZipObject(props, values, assignFunc) {
+ var index = -1,
+ length = props.length,
+ valsLength = values.length,
+ result = {};
+
+ while (++index < length) {
+ var value = index < valsLength ? values[index] : undefined;
+ assignFunc(result, props[index], value);
+ }
+ return result;
+ }
+
+ /**
+ * Casts \`value\` to an empty array if it's not an array like object.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array|Object} Returns the cast array-like object.
+ */
+ function castArrayLikeObject(value) {
+ return isArrayLikeObject(value) ? value : [];
+ }
+
+ /**
+ * Casts \`value\` to \`identity\` if it's not a function.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Function} Returns cast function.
+ */
+ function castFunction(value) {
+ return typeof value == 'function' ? value : identity;
+ }
+
+ /**
+ * Casts \`value\` to a path array if it's not one.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @param {Object} [object] The object to query keys on.
+ * @returns {Array} Returns the cast property path array.
+ */
+ function castPath(value, object) {
+ if (isArray(value)) {
+ return value;
+ }
+ return isKey(value, object) ? [value] : stringToPath(toString(value));
+ }
+
+ /**
+ * A \`baseRest\` alias which can be replaced with \`identity\` by module
+ * replacement plugins.
+ *
+ * @private
+ * @type {Function}
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+ var castRest = baseRest;
+
+ /**
+ * Casts \`array\` to a slice if it's needed.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {number} start The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the cast slice.
+ */
+ function castSlice(array, start, end) {
+ var length = array.length;
+ end = end === undefined ? length : end;
+ return (!start && end >= length) ? array : baseSlice(array, start, end);
+ }
+
+ /**
+ * A simple wrapper around the global [\`clearTimeout\`](https://mdn.io/clearTimeout).
+ *
+ * @private
+ * @param {number|Object} id The timer id or timeout object of the timer to clear.
+ */
+ var clearTimeout = ctxClearTimeout || function(id) {
+ return root.clearTimeout(id);
+ };
+
+ /**
+ * Creates a clone of \`buffer\`.
+ *
+ * @private
+ * @param {Buffer} buffer The buffer to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Buffer} Returns the cloned buffer.
+ */
+ function cloneBuffer(buffer, isDeep) {
+ if (isDeep) {
+ return buffer.slice();
+ }
+ var length = buffer.length,
+ result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
+
+ buffer.copy(result);
+ return result;
+ }
+
+ /**
+ * Creates a clone of \`arrayBuffer\`.
+ *
+ * @private
+ * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+ * @returns {ArrayBuffer} Returns the cloned array buffer.
+ */
+ function cloneArrayBuffer(arrayBuffer) {
+ var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
+ new Uint8Array(result).set(new Uint8Array(arrayBuffer));
+ return result;
+ }
+
+ /**
+ * Creates a clone of \`dataView\`.
+ *
+ * @private
+ * @param {Object} dataView The data view to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the cloned data view.
+ */
+ function cloneDataView(dataView, isDeep) {
+ var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
+ return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
+ }
+
+ /**
+ * Creates a clone of \`regexp\`.
+ *
+ * @private
+ * @param {Object} regexp The regexp to clone.
+ * @returns {Object} Returns the cloned regexp.
+ */
+ function cloneRegExp(regexp) {
+ var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
+ result.lastIndex = regexp.lastIndex;
+ return result;
+ }
+
+ /**
+ * Creates a clone of the \`symbol\` object.
+ *
+ * @private
+ * @param {Object} symbol The symbol object to clone.
+ * @returns {Object} Returns the cloned symbol object.
+ */
+ function cloneSymbol(symbol) {
+ return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
+ }
+
+ /**
+ * Creates a clone of \`typedArray\`.
+ *
+ * @private
+ * @param {Object} typedArray The typed array to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the cloned typed array.
+ */
+ function cloneTypedArray(typedArray, isDeep) {
+ var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
+ return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
+ }
+
+ /**
+ * Compares values to sort them in ascending order.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {number} Returns the sort order indicator for \`value\`.
+ */
+ function compareAscending(value, other) {
+ if (value !== other) {
+ var valIsDefined = value !== undefined,
+ valIsNull = value === null,
+ valIsReflexive = value === value,
+ valIsSymbol = isSymbol(value);
+
+ var othIsDefined = other !== undefined,
+ othIsNull = other === null,
+ othIsReflexive = other === other,
+ othIsSymbol = isSymbol(other);
+
+ if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
+ (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
+ (valIsNull && othIsDefined && othIsReflexive) ||
+ (!valIsDefined && othIsReflexive) ||
+ !valIsReflexive) {
+ return 1;
+ }
+ if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
+ (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
+ (othIsNull && valIsDefined && valIsReflexive) ||
+ (!othIsDefined && valIsReflexive) ||
+ !othIsReflexive) {
+ return -1;
+ }
+ }
+ return 0;
+ }
+
+ /**
+ * Used by \`_.orderBy\` to compare multiple properties of a value to another
+ * and stable sort them.
+ *
+ * If \`orders\` is unspecified, all values are sorted in ascending order. Otherwise,
+ * specify an order of \\"desc\\" for descending or \\"asc\\" for ascending sort order
+ * of corresponding values.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {boolean[]|string[]} orders The order to sort by for each property.
+ * @returns {number} Returns the sort order indicator for \`object\`.
+ */
+ function compareMultiple(object, other, orders) {
+ var index = -1,
+ objCriteria = object.criteria,
+ othCriteria = other.criteria,
+ length = objCriteria.length,
+ ordersLength = orders.length;
+
+ while (++index < length) {
+ var result = compareAscending(objCriteria[index], othCriteria[index]);
+ if (result) {
+ if (index >= ordersLength) {
+ return result;
+ }
+ var order = orders[index];
+ return result * (order == 'desc' ? -1 : 1);
+ }
+ }
+ // Fixes an \`Array#sort\` bug in the JS engine embedded in Adobe applications
+ // that causes it, under certain circumstances, to provide the same value for
+ // \`object\` and \`other\`. See https://github.com/jashkenas/underscore/pull/1247
+ // for more details.
+ //
+ // This also ensures a stable sort in V8 and other engines.
+ // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
+ return object.index - other.index;
+ }
+
+ /**
+ * Creates an array that is the composition of partially applied arguments,
+ * placeholders, and provided arguments into a single array of arguments.
+ *
+ * @private
+ * @param {Array} args The provided arguments.
+ * @param {Array} partials The arguments to prepend to those provided.
+ * @param {Array} holders The \`partials\` placeholder indexes.
+ * @params {boolean} [isCurried] Specify composing for a curried function.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgs(args, partials, holders, isCurried) {
+ var argsIndex = -1,
+ argsLength = args.length,
+ holdersLength = holders.length,
+ leftIndex = -1,
+ leftLength = partials.length,
+ rangeLength = nativeMax(argsLength - holdersLength, 0),
+ result = Array(leftLength + rangeLength),
+ isUncurried = !isCurried;
+
+ while (++leftIndex < leftLength) {
+ result[leftIndex] = partials[leftIndex];
+ }
+ while (++argsIndex < holdersLength) {
+ if (isUncurried || argsIndex < argsLength) {
+ result[holders[argsIndex]] = args[argsIndex];
+ }
+ }
+ while (rangeLength--) {
+ result[leftIndex++] = args[argsIndex++];
+ }
+ return result;
+ }
+
+ /**
+ * This function is like \`composeArgs\` except that the arguments composition
+ * is tailored for \`_.partialRight\`.
+ *
+ * @private
+ * @param {Array} args The provided arguments.
+ * @param {Array} partials The arguments to append to those provided.
+ * @param {Array} holders The \`partials\` placeholder indexes.
+ * @params {boolean} [isCurried] Specify composing for a curried function.
+ * @returns {Array} Returns the new array of composed arguments.
+ */
+ function composeArgsRight(args, partials, holders, isCurried) {
+ var argsIndex = -1,
+ argsLength = args.length,
+ holdersIndex = -1,
+ holdersLength = holders.length,
+ rightIndex = -1,
+ rightLength = partials.length,
+ rangeLength = nativeMax(argsLength - holdersLength, 0),
+ result = Array(rangeLength + rightLength),
+ isUncurried = !isCurried;
+
+ while (++argsIndex < rangeLength) {
+ result[argsIndex] = args[argsIndex];
+ }
+ var offset = argsIndex;
+ while (++rightIndex < rightLength) {
+ result[offset + rightIndex] = partials[rightIndex];
+ }
+ while (++holdersIndex < holdersLength) {
+ if (isUncurried || argsIndex < argsLength) {
+ result[offset + holders[holdersIndex]] = args[argsIndex++];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Copies the values of \`source\` to \`array\`.
+ *
+ * @private
+ * @param {Array} source The array to copy values from.
+ * @param {Array} [array=[]] The array to copy values to.
+ * @returns {Array} Returns \`array\`.
+ */
+ function copyArray(source, array) {
+ var index = -1,
+ length = source.length;
+
+ array || (array = Array(length));
+ while (++index < length) {
+ array[index] = source[index];
+ }
+ return array;
+ }
+
+ /**
+ * Copies properties of \`source\` to \`object\`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property identifiers to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @param {Function} [customizer] The function to customize copied values.
+ * @returns {Object} Returns \`object\`.
+ */
+ function copyObject(source, props, object, customizer) {
+ var isNew = !object;
+ object || (object = {});
+
+ var index = -1,
+ length = props.length;
+
+ while (++index < length) {
+ var key = props[index];
+
+ var newValue = customizer
+ ? customizer(object[key], source[key], key, object, source)
+ : undefined;
+
+ if (newValue === undefined) {
+ newValue = source[key];
+ }
+ if (isNew) {
+ baseAssignValue(object, key, newValue);
+ } else {
+ assignValue(object, key, newValue);
+ }
+ }
+ return object;
+ }
+
+ /**
+ * Copies own symbols of \`source\` to \`object\`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns \`object\`.
+ */
+ function copySymbols(source, object) {
+ return copyObject(source, getSymbols(source), object);
+ }
+
+ /**
+ * Copies own and inherited symbols of \`source\` to \`object\`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns \`object\`.
+ */
+ function copySymbolsIn(source, object) {
+ return copyObject(source, getSymbolsIn(source), object);
+ }
+
+ /**
+ * Creates a function like \`_.groupBy\`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+ function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, getIteratee(iteratee, 2), accumulator);
+ };
+ }
+
+ /**
+ * Creates a function like \`_.assign\`.
+ *
+ * @private
+ * @param {Function} assigner The function to assign values.
+ * @returns {Function} Returns the new assigner function.
+ */
+ function createAssigner(assigner) {
+ return baseRest(function(object, sources) {
+ var index = -1,
+ length = sources.length,
+ customizer = length > 1 ? sources[length - 1] : undefined,
+ guard = length > 2 ? sources[2] : undefined;
+
+ customizer = (assigner.length > 3 && typeof customizer == 'function')
+ ? (length--, customizer)
+ : undefined;
+
+ if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+ customizer = length < 3 ? undefined : customizer;
+ length = 1;
+ }
+ object = Object(object);
+ while (++index < length) {
+ var source = sources[index];
+ if (source) {
+ assigner(object, source, index, customizer);
+ }
+ }
+ return object;
+ });
+ }
+
+ /**
+ * Creates a \`baseEach\` or \`baseEachRight\` function.
+ *
+ * @private
+ * @param {Function} eachFunc The function to iterate over a collection.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseEach(eachFunc, fromRight) {
+ return function(collection, iteratee) {
+ if (collection == null) {
+ return collection;
+ }
+ if (!isArrayLike(collection)) {
+ return eachFunc(collection, iteratee);
+ }
+ var length = collection.length,
+ index = fromRight ? length : -1,
+ iterable = Object(collection);
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (iteratee(iterable[index], index, iterable) === false) {
+ break;
+ }
+ }
+ return collection;
+ };
+ }
+
+ /**
+ * Creates a base function for methods like \`_.forIn\` and \`_.forOwn\`.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new base function.
+ */
+ function createBaseFor(fromRight) {
+ return function(object, iteratee, keysFunc) {
+ var index = -1,
+ iterable = Object(object),
+ props = keysFunc(object),
+ length = props.length;
+
+ while (length--) {
+ var key = props[fromRight ? length : ++index];
+ if (iteratee(iterable[key], key, iterable) === false) {
+ break;
+ }
+ }
+ return object;
+ };
+ }
+
+ /**
+ * Creates a function that wraps \`func\` to invoke it with the optional \`this\`
+ * binding of \`thisArg\`.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @param {*} [thisArg] The \`this\` binding of \`func\`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createBind(func, bitmask, thisArg) {
+ var isBind = bitmask & WRAP_BIND_FLAG,
+ Ctor = createCtor(func);
+
+ function wrapper() {
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return fn.apply(isBind ? thisArg : this, arguments);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a function like \`_.lowerFirst\`.
+ *
+ * @private
+ * @param {string} methodName The name of the \`String\` case method to use.
+ * @returns {Function} Returns the new case function.
+ */
+ function createCaseFirst(methodName) {
+ return function(string) {
+ string = toString(string);
+
+ var strSymbols = hasUnicode(string)
+ ? stringToArray(string)
+ : undefined;
+
+ var chr = strSymbols
+ ? strSymbols[0]
+ : string.charAt(0);
+
+ var trailing = strSymbols
+ ? castSlice(strSymbols, 1).join('')
+ : string.slice(1);
+
+ return chr[methodName]() + trailing;
+ };
+ }
+
+ /**
+ * Creates a function like \`_.camelCase\`.
+ *
+ * @private
+ * @param {Function} callback The function to combine each word.
+ * @returns {Function} Returns the new compounder function.
+ */
+ function createCompounder(callback) {
+ return function(string) {
+ return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
+ };
+ }
+
+ /**
+ * Creates a function that produces an instance of \`Ctor\` regardless of
+ * whether it was invoked as part of a \`new\` expression or by \`call\` or \`apply\`.
+ *
+ * @private
+ * @param {Function} Ctor The constructor to wrap.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createCtor(Ctor) {
+ return function() {
+ // Use a \`switch\` statement to work with class constructors. See
+ // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
+ // for more details.
+ var args = arguments;
+ switch (args.length) {
+ case 0: return new Ctor;
+ case 1: return new Ctor(args[0]);
+ case 2: return new Ctor(args[0], args[1]);
+ case 3: return new Ctor(args[0], args[1], args[2]);
+ case 4: return new Ctor(args[0], args[1], args[2], args[3]);
+ case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
+ case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
+ case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
+ }
+ var thisBinding = baseCreate(Ctor.prototype),
+ result = Ctor.apply(thisBinding, args);
+
+ // Mimic the constructor's \`return\` behavior.
+ // See https://es5.github.io/#x13.2.2 for more details.
+ return isObject(result) ? result : thisBinding;
+ };
+ }
+
+ /**
+ * Creates a function that wraps \`func\` to enable currying.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @param {number} arity The arity of \`func\`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createCurry(func, bitmask, arity) {
+ var Ctor = createCtor(func);
+
+ function wrapper() {
+ var length = arguments.length,
+ args = Array(length),
+ index = length,
+ placeholder = getHolder(wrapper);
+
+ while (index--) {
+ args[index] = arguments[index];
+ }
+ var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
+ ? []
+ : replaceHolders(args, placeholder);
+
+ length -= holders.length;
+ if (length < arity) {
+ return createRecurry(
+ func, bitmask, createHybrid, wrapper.placeholder, undefined,
+ args, holders, undefined, undefined, arity - length);
+ }
+ var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+ return apply(fn, this, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a \`_.find\` or \`_.findLast\` function.
+ *
+ * @private
+ * @param {Function} findIndexFunc The function to find the collection index.
+ * @returns {Function} Returns the new find function.
+ */
+ function createFind(findIndexFunc) {
+ return function(collection, predicate, fromIndex) {
+ var iterable = Object(collection);
+ if (!isArrayLike(collection)) {
+ var iteratee = getIteratee(predicate, 3);
+ collection = keys(collection);
+ predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+ }
+ var index = findIndexFunc(collection, predicate, fromIndex);
+ return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+ };
+ }
+
+ /**
+ * Creates a \`_.flow\` or \`_.flowRight\` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new flow function.
+ */
+ function createFlow(fromRight) {
+ return flatRest(function(funcs) {
+ var length = funcs.length,
+ index = length,
+ prereq = LodashWrapper.prototype.thru;
+
+ if (fromRight) {
+ funcs.reverse();
+ }
+ while (index--) {
+ var func = funcs[index];
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
+ var wrapper = new LodashWrapper([], true);
+ }
+ }
+ index = wrapper ? index : length;
+ while (++index < length) {
+ func = funcs[index];
+
+ var funcName = getFuncName(func),
+ data = funcName == 'wrapper' ? getData(func) : undefined;
+
+ if (data && isLaziable(data[0]) &&
+ data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
+ !data[4].length && data[9] == 1
+ ) {
+ wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
+ } else {
+ wrapper = (func.length == 1 && isLaziable(func))
+ ? wrapper[funcName]()
+ : wrapper.thru(func);
+ }
+ }
+ return function() {
+ var args = arguments,
+ value = args[0];
+
+ if (wrapper && args.length == 1 && isArray(value)) {
+ return wrapper.plant(value).value();
+ }
+ var index = 0,
+ result = length ? funcs[index].apply(this, args) : value;
+
+ while (++index < length) {
+ result = funcs[index].call(this, result);
+ }
+ return result;
+ };
+ });
+ }
+
+ /**
+ * Creates a function that wraps \`func\` to invoke it with optional \`this\`
+ * binding of \`thisArg\`, partial application, and currying.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to wrap.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @param {*} [thisArg] The \`this\` binding of \`func\`.
+ * @param {Array} [partials] The arguments to prepend to those provided to
+ * the new function.
+ * @param {Array} [holders] The \`partials\` placeholder indexes.
+ * @param {Array} [partialsRight] The arguments to append to those provided
+ * to the new function.
+ * @param {Array} [holdersRight] The \`partialsRight\` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of \`func\`.
+ * @param {number} [arity] The arity of \`func\`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+ var isAry = bitmask & WRAP_ARY_FLAG,
+ isBind = bitmask & WRAP_BIND_FLAG,
+ isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
+ isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
+ isFlip = bitmask & WRAP_FLIP_FLAG,
+ Ctor = isBindKey ? undefined : createCtor(func);
+
+ function wrapper() {
+ var length = arguments.length,
+ args = Array(length),
+ index = length;
+
+ while (index--) {
+ args[index] = arguments[index];
+ }
+ if (isCurried) {
+ var placeholder = getHolder(wrapper),
+ holdersCount = countHolders(args, placeholder);
+ }
+ if (partials) {
+ args = composeArgs(args, partials, holders, isCurried);
+ }
+ if (partialsRight) {
+ args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
+ }
+ length -= holdersCount;
+ if (isCurried && length < arity) {
+ var newHolders = replaceHolders(args, placeholder);
+ return createRecurry(
+ func, bitmask, createHybrid, wrapper.placeholder, thisArg,
+ args, newHolders, argPos, ary, arity - length
+ );
+ }
+ var thisBinding = isBind ? thisArg : this,
+ fn = isBindKey ? thisBinding[func] : func;
+
+ length = args.length;
+ if (argPos) {
+ args = reorder(args, argPos);
+ } else if (isFlip && length > 1) {
+ args.reverse();
+ }
+ if (isAry && ary < length) {
+ args.length = ary;
+ }
+ if (this && this !== root && this instanceof wrapper) {
+ fn = Ctor || createCtor(fn);
+ }
+ return fn.apply(thisBinding, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a function like \`_.invertBy\`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} toIteratee The function to resolve iteratees.
+ * @returns {Function} Returns the new inverter function.
+ */
+ function createInverter(setter, toIteratee) {
+ return function(object, iteratee) {
+ return baseInverter(object, setter, toIteratee(iteratee), {});
+ };
+ }
+
+ /**
+ * Creates a function that performs a mathematical operation on two values.
+ *
+ * @private
+ * @param {Function} operator The function to perform the operation.
+ * @param {number} [defaultValue] The value used for \`undefined\` arguments.
+ * @returns {Function} Returns the new mathematical operation function.
+ */
+ function createMathOperation(operator, defaultValue) {
+ return function(value, other) {
+ var result;
+ if (value === undefined && other === undefined) {
+ return defaultValue;
+ }
+ if (value !== undefined) {
+ result = value;
+ }
+ if (other !== undefined) {
+ if (result === undefined) {
+ return other;
+ }
+ if (typeof value == 'string' || typeof other == 'string') {
+ value = baseToString(value);
+ other = baseToString(other);
+ } else {
+ value = baseToNumber(value);
+ other = baseToNumber(other);
+ }
+ result = operator(value, other);
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function like \`_.over\`.
+ *
+ * @private
+ * @param {Function} arrayFunc The function to iterate over iteratees.
+ * @returns {Function} Returns the new over function.
+ */
+ function createOver(arrayFunc) {
+ return flatRest(function(iteratees) {
+ iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
+ return baseRest(function(args) {
+ var thisArg = this;
+ return arrayFunc(iteratees, function(iteratee) {
+ return apply(iteratee, thisArg, args);
+ });
+ });
+ });
+ }
+
+ /**
+ * Creates the padding for \`string\` based on \`length\`. The \`chars\` string
+ * is truncated if the number of characters exceeds \`length\`.
+ *
+ * @private
+ * @param {number} length The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padding for \`string\`.
+ */
+ function createPadding(length, chars) {
+ chars = chars === undefined ? ' ' : baseToString(chars);
+
+ var charsLength = chars.length;
+ if (charsLength < 2) {
+ return charsLength ? baseRepeat(chars, length) : chars;
+ }
+ var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
+ return hasUnicode(chars)
+ ? castSlice(stringToArray(result), 0, length).join('')
+ : result.slice(0, length);
+ }
+
+ /**
+ * Creates a function that wraps \`func\` to invoke it with the \`this\` binding
+ * of \`thisArg\` and \`partials\` prepended to the arguments it receives.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @param {*} thisArg The \`this\` binding of \`func\`.
+ * @param {Array} partials The arguments to prepend to those provided to
+ * the new function.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createPartial(func, bitmask, thisArg, partials) {
+ var isBind = bitmask & WRAP_BIND_FLAG,
+ Ctor = createCtor(func);
+
+ function wrapper() {
+ var argsIndex = -1,
+ argsLength = arguments.length,
+ leftIndex = -1,
+ leftLength = partials.length,
+ args = Array(leftLength + argsLength),
+ fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
+
+ while (++leftIndex < leftLength) {
+ args[leftIndex] = partials[leftIndex];
+ }
+ while (argsLength--) {
+ args[leftIndex++] = arguments[++argsIndex];
+ }
+ return apply(fn, isBind ? thisArg : this, args);
+ }
+ return wrapper;
+ }
+
+ /**
+ * Creates a \`_.range\` or \`_.rangeRight\` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new range function.
+ */
+ function createRange(fromRight) {
+ return function(start, end, step) {
+ if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
+ end = step = undefined;
+ }
+ // Ensure the sign of \`-0\` is preserved.
+ start = toFinite(start);
+ if (end === undefined) {
+ end = start;
+ start = 0;
+ } else {
+ end = toFinite(end);
+ }
+ step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
+ return baseRange(start, end, step, fromRight);
+ };
+ }
+
+ /**
+ * Creates a function that performs a relational operation on two values.
+ *
+ * @private
+ * @param {Function} operator The function to perform the operation.
+ * @returns {Function} Returns the new relational operation function.
+ */
+ function createRelationalOperation(operator) {
+ return function(value, other) {
+ if (!(typeof value == 'string' && typeof other == 'string')) {
+ value = toNumber(value);
+ other = toNumber(other);
+ }
+ return operator(value, other);
+ };
+ }
+
+ /**
+ * Creates a function that wraps \`func\` to continue currying.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @param {Function} wrapFunc The function to create the \`func\` wrapper.
+ * @param {*} placeholder The placeholder value.
+ * @param {*} [thisArg] The \`this\` binding of \`func\`.
+ * @param {Array} [partials] The arguments to prepend to those provided to
+ * the new function.
+ * @param {Array} [holders] The \`partials\` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of \`func\`.
+ * @param {number} [arity] The arity of \`func\`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
+ var isCurry = bitmask & WRAP_CURRY_FLAG,
+ newHolders = isCurry ? holders : undefined,
+ newHoldersRight = isCurry ? undefined : holders,
+ newPartials = isCurry ? partials : undefined,
+ newPartialsRight = isCurry ? undefined : partials;
+
+ bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
+ bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
+
+ if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
+ bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
+ }
+ var newData = [
+ func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
+ newHoldersRight, argPos, ary, arity
+ ];
+
+ var result = wrapFunc.apply(undefined, newData);
+ if (isLaziable(func)) {
+ setData(result, newData);
+ }
+ result.placeholder = placeholder;
+ return setWrapToString(result, func, bitmask);
+ }
+
+ /**
+ * Creates a function like \`_.round\`.
+ *
+ * @private
+ * @param {string} methodName The name of the \`Math\` method to use when rounding.
+ * @returns {Function} Returns the new round function.
+ */
+ function createRound(methodName) {
+ var func = Math[methodName];
+ return function(number, precision) {
+ number = toNumber(number);
+ precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
+ if (precision && nativeIsFinite(number)) {
+ // Shift with exponential notation to avoid floating-point issues.
+ // See [MDN](https://mdn.io/round#Examples) for more details.
+ var pair = (toString(number) + 'e').split('e'),
+ value = func(pair[0] + 'e' + (+pair[1] + precision));
+
+ pair = (toString(value) + 'e').split('e');
+ return +(pair[0] + 'e' + (+pair[1] - precision));
+ }
+ return func(number);
+ };
+ }
+
+ /**
+ * Creates a set object of \`values\`.
+ *
+ * @private
+ * @param {Array} values The values to add to the set.
+ * @returns {Object} Returns the new set.
+ */
+ var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
+ return new Set(values);
+ };
+
+ /**
+ * Creates a \`_.toPairs\` or \`_.toPairsIn\` function.
+ *
+ * @private
+ * @param {Function} keysFunc The function to get the keys of a given object.
+ * @returns {Function} Returns the new pairs function.
+ */
+ function createToPairs(keysFunc) {
+ return function(object) {
+ var tag = getTag(object);
+ if (tag == mapTag) {
+ return mapToArray(object);
+ }
+ if (tag == setTag) {
+ return setToPairs(object);
+ }
+ return baseToPairs(object, keysFunc(object));
+ };
+ }
+
+ /**
+ * Creates a function that either curries or invokes \`func\` with optional
+ * \`this\` binding and partially applied arguments.
+ *
+ * @private
+ * @param {Function|string} func The function or method name to wrap.
+ * @param {number} bitmask The bitmask flags.
+ * 1 - \`_.bind\`
+ * 2 - \`_.bindKey\`
+ * 4 - \`_.curry\` or \`_.curryRight\` of a bound function
+ * 8 - \`_.curry\`
+ * 16 - \`_.curryRight\`
+ * 32 - \`_.partial\`
+ * 64 - \`_.partialRight\`
+ * 128 - \`_.rearg\`
+ * 256 - \`_.ary\`
+ * 512 - \`_.flip\`
+ * @param {*} [thisArg] The \`this\` binding of \`func\`.
+ * @param {Array} [partials] The arguments to be partially applied.
+ * @param {Array} [holders] The \`partials\` placeholder indexes.
+ * @param {Array} [argPos] The argument positions of the new function.
+ * @param {number} [ary] The arity cap of \`func\`.
+ * @param {number} [arity] The arity of \`func\`.
+ * @returns {Function} Returns the new wrapped function.
+ */
+ function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+ var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
+ if (!isBindKey && typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var length = partials ? partials.length : 0;
+ if (!length) {
+ bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
+ partials = holders = undefined;
+ }
+ ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
+ arity = arity === undefined ? arity : toInteger(arity);
+ length -= holders ? holders.length : 0;
+
+ if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
+ var partialsRight = partials,
+ holdersRight = holders;
+
+ partials = holders = undefined;
+ }
+ var data = isBindKey ? undefined : getData(func);
+
+ var newData = [
+ func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
+ argPos, ary, arity
+ ];
+
+ if (data) {
+ mergeData(newData, data);
+ }
+ func = newData[0];
+ bitmask = newData[1];
+ thisArg = newData[2];
+ partials = newData[3];
+ holders = newData[4];
+ arity = newData[9] = newData[9] === undefined
+ ? (isBindKey ? 0 : func.length)
+ : nativeMax(newData[9] - length, 0);
+
+ if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
+ bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
+ }
+ if (!bitmask || bitmask == WRAP_BIND_FLAG) {
+ var result = createBind(func, bitmask, thisArg);
+ } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
+ result = createCurry(func, bitmask, arity);
+ } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
+ result = createPartial(func, bitmask, thisArg, partials);
+ } else {
+ result = createHybrid.apply(undefined, newData);
+ }
+ var setter = data ? baseSetData : setData;
+ return setWrapToString(setter(result, newData), func, bitmask);
+ }
+
+ /**
+ * Used by \`_.defaults\` to customize its \`_.assignIn\` use to assign properties
+ * of source objects to the destination object for all destination properties
+ * that resolve to \`undefined\`.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to assign.
+ * @param {Object} object The parent object of \`objValue\`.
+ * @returns {*} Returns the value to assign.
+ */
+ function customDefaultsAssignIn(objValue, srcValue, key, object) {
+ if (objValue === undefined ||
+ (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+ return srcValue;
+ }
+ return objValue;
+ }
+
+ /**
+ * Used by \`_.defaultsDeep\` to customize its \`_.merge\` use to merge source
+ * objects into destination objects that are passed thru.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to merge.
+ * @param {Object} object The parent object of \`objValue\`.
+ * @param {Object} source The parent object of \`srcValue\`.
+ * @param {Object} [stack] Tracks traversed source values and their merged
+ * counterparts.
+ * @returns {*} Returns the value to assign.
+ */
+ function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
+ if (isObject(objValue) && isObject(srcValue)) {
+ // Recursively merge objects and arrays (susceptible to call stack limits).
+ stack.set(srcValue, objValue);
+ baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
+ stack['delete'](srcValue);
+ }
+ return objValue;
+ }
+
+ /**
+ * Used by \`_.omit\` to customize its \`_.cloneDeep\` use to only clone plain
+ * objects.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @param {string} key The key of the property to inspect.
+ * @returns {*} Returns the uncloned value or \`undefined\` to defer cloning to \`_.cloneDeep\`.
+ */
+ function customOmitClone(value) {
+ return isPlainObject(value) ? undefined : value;
+ }
+
+ /**
+ * A specialized version of \`baseIsEqualDeep\` for arrays with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Array} array The array to compare.
+ * @param {Array} other The other array to compare.
+ * @param {number} bitmask The bitmask flags. See \`baseIsEqual\` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed \`array\` and \`other\` objects.
+ * @returns {boolean} Returns \`true\` if the arrays are equivalent, else \`false\`.
+ */
+ function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+ arrLength = array.length,
+ othLength = other.length;
+
+ if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
+ return false;
+ }
+ // Assume cyclic values are equal.
+ var stacked = stack.get(array);
+ if (stacked && stack.get(other)) {
+ return stacked == other;
+ }
+ var index = -1,
+ result = true,
+ seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
+
+ stack.set(array, other);
+ stack.set(other, array);
+
+ // Ignore non-index properties.
+ while (++index < arrLength) {
+ var arrValue = array[index],
+ othValue = other[index];
+
+ if (customizer) {
+ var compared = isPartial
+ ? customizer(othValue, arrValue, index, other, array, stack)
+ : customizer(arrValue, othValue, index, array, other, stack);
+ }
+ if (compared !== undefined) {
+ if (compared) {
+ continue;
+ }
+ result = false;
+ break;
+ }
+ // Recursively compare arrays (susceptible to call stack limits).
+ if (seen) {
+ if (!arraySome(other, function(othValue, othIndex) {
+ if (!cacheHas(seen, othIndex) &&
+ (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
+ return seen.push(othIndex);
+ }
+ })) {
+ result = false;
+ break;
+ }
+ } else if (!(
+ arrValue === othValue ||
+ equalFunc(arrValue, othValue, bitmask, customizer, stack)
+ )) {
+ result = false;
+ break;
+ }
+ }
+ stack['delete'](array);
+ stack['delete'](other);
+ return result;
+ }
+
+ /**
+ * A specialized version of \`baseIsEqualDeep\` for comparing objects of
+ * the same \`toStringTag\`.
+ *
+ * **Note:** This function only supports comparing values with tags of
+ * \`Boolean\`, \`Date\`, \`Error\`, \`Number\`, \`RegExp\`, or \`String\`.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {string} tag The \`toStringTag\` of the objects to compare.
+ * @param {number} bitmask The bitmask flags. See \`baseIsEqual\` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed \`object\` and \`other\` objects.
+ * @returns {boolean} Returns \`true\` if the objects are equivalent, else \`false\`.
+ */
+ function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
+ switch (tag) {
+ case dataViewTag:
+ if ((object.byteLength != other.byteLength) ||
+ (object.byteOffset != other.byteOffset)) {
+ return false;
+ }
+ object = object.buffer;
+ other = other.buffer;
+
+ case arrayBufferTag:
+ if ((object.byteLength != other.byteLength) ||
+ !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
+ return false;
+ }
+ return true;
+
+ case boolTag:
+ case dateTag:
+ case numberTag:
+ // Coerce booleans to \`1\` or \`0\` and dates to milliseconds.
+ // Invalid dates are coerced to \`NaN\`.
+ return eq(+object, +other);
+
+ case errorTag:
+ return object.name == other.name && object.message == other.message;
+
+ case regexpTag:
+ case stringTag:
+ // Coerce regexes to strings and treat strings, primitives and objects,
+ // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
+ // for more details.
+ return object == (other + '');
+
+ case mapTag:
+ var convert = mapToArray;
+
+ case setTag:
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
+ convert || (convert = setToArray);
+
+ if (object.size != other.size && !isPartial) {
+ return false;
+ }
+ // Assume cyclic values are equal.
+ var stacked = stack.get(object);
+ if (stacked) {
+ return stacked == other;
+ }
+ bitmask |= COMPARE_UNORDERED_FLAG;
+
+ // Recursively compare objects (susceptible to call stack limits).
+ stack.set(object, other);
+ var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
+ stack['delete'](object);
+ return result;
+
+ case symbolTag:
+ if (symbolValueOf) {
+ return symbolValueOf.call(object) == symbolValueOf.call(other);
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A specialized version of \`baseIsEqualDeep\` for objects with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {number} bitmask The bitmask flags. See \`baseIsEqual\` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Object} stack Tracks traversed \`object\` and \`other\` objects.
+ * @returns {boolean} Returns \`true\` if the objects are equivalent, else \`false\`.
+ */
+ function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
+ var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
+ objProps = getAllKeys(object),
+ objLength = objProps.length,
+ othProps = getAllKeys(other),
+ othLength = othProps.length;
+
+ if (objLength != othLength && !isPartial) {
+ return false;
+ }
+ var index = objLength;
+ while (index--) {
+ var key = objProps[index];
+ if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
+ return false;
+ }
+ }
+ // Assume cyclic values are equal.
+ var stacked = stack.get(object);
+ if (stacked && stack.get(other)) {
+ return stacked == other;
+ }
+ var result = true;
+ stack.set(object, other);
+ stack.set(other, object);
+
+ var skipCtor = isPartial;
+ while (++index < objLength) {
+ key = objProps[index];
+ var objValue = object[key],
+ othValue = other[key];
+
+ if (customizer) {
+ var compared = isPartial
+ ? customizer(othValue, objValue, key, other, object, stack)
+ : customizer(objValue, othValue, key, object, other, stack);
+ }
+ // Recursively compare objects (susceptible to call stack limits).
+ if (!(compared === undefined
+ ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
+ : compared
+ )) {
+ result = false;
+ break;
+ }
+ skipCtor || (skipCtor = key == 'constructor');
+ }
+ if (result && !skipCtor) {
+ var objCtor = object.constructor,
+ othCtor = other.constructor;
+
+ // Non \`Object\` object instances with different constructors are not equal.
+ if (objCtor != othCtor &&
+ ('constructor' in object && 'constructor' in other) &&
+ !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
+ typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+ result = false;
+ }
+ }
+ stack['delete'](object);
+ stack['delete'](other);
+ return result;
+ }
+
+ /**
+ * A specialized version of \`baseRest\` which flattens the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+ function flatRest(func) {
+ return setToString(overRest(func, undefined, flatten), func + '');
+ }
+
+ /**
+ * Creates an array of own enumerable property names and symbols of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function getAllKeys(object) {
+ return baseGetAllKeys(object, keys, getSymbols);
+ }
+
+ /**
+ * Creates an array of own and inherited enumerable property names and
+ * symbols of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+ function getAllKeysIn(object) {
+ return baseGetAllKeys(object, keysIn, getSymbolsIn);
+ }
+
+ /**
+ * Gets metadata for \`func\`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {*} Returns the metadata for \`func\`.
+ */
+ var getData = !metaMap ? noop : function(func) {
+ return metaMap.get(func);
+ };
+
+ /**
+ * Gets the name of \`func\`.
+ *
+ * @private
+ * @param {Function} func The function to query.
+ * @returns {string} Returns the function name.
+ */
+ function getFuncName(func) {
+ var result = (func.name + ''),
+ array = realNames[result],
+ length = hasOwnProperty.call(realNames, result) ? array.length : 0;
+
+ while (length--) {
+ var data = array[length],
+ otherFunc = data.func;
+ if (otherFunc == null || otherFunc == func) {
+ return data.name;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the argument placeholder value for \`func\`.
+ *
+ * @private
+ * @param {Function} func The function to inspect.
+ * @returns {*} Returns the placeholder value.
+ */
+ function getHolder(func) {
+ var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
+ return object.placeholder;
+ }
+
+ /**
+ * Gets the appropriate \\"iteratee\\" function. If \`_.iteratee\` is customized,
+ * this function returns the custom method, otherwise it returns \`baseIteratee\`.
+ * If arguments are provided, the chosen function is invoked with them and
+ * its result is returned.
+ *
+ * @private
+ * @param {*} [value] The value to convert to an iteratee.
+ * @param {number} [arity] The arity of the created iteratee.
+ * @returns {Function} Returns the chosen function or its result.
+ */
+ function getIteratee() {
+ var result = lodash.iteratee || iteratee;
+ result = result === iteratee ? baseIteratee : result;
+ return arguments.length ? result(arguments[0], arguments[1]) : result;
+ }
+
+ /**
+ * Gets the data for \`map\`.
+ *
+ * @private
+ * @param {Object} map The map to query.
+ * @param {string} key The reference key.
+ * @returns {*} Returns the map data.
+ */
+ function getMapData(map, key) {
+ var data = map.__data__;
+ return isKeyable(key)
+ ? data[typeof key == 'string' ? 'string' : 'hash']
+ : data.map;
+ }
+
+ /**
+ * Gets the property names, values, and compare flags of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the match data of \`object\`.
+ */
+ function getMatchData(object) {
+ var result = keys(object),
+ length = result.length;
+
+ while (length--) {
+ var key = result[length],
+ value = object[key];
+
+ result[length] = [key, value, isStrictComparable(value)];
+ }
+ return result;
+ }
+
+ /**
+ * Gets the native function at \`key\` of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the method to get.
+ * @returns {*} Returns the function if it's native, else \`undefined\`.
+ */
+ function getNative(object, key) {
+ var value = getValue(object, key);
+ return baseIsNative(value) ? value : undefined;
+ }
+
+ /**
+ * A specialized version of \`baseGetTag\` which ignores \`Symbol.toStringTag\` values.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the raw \`toStringTag\`.
+ */
+ function getRawTag(value) {
+ var isOwn = hasOwnProperty.call(value, symToStringTag),
+ tag = value[symToStringTag];
+
+ try {
+ value[symToStringTag] = undefined;
+ var unmasked = true;
+ } catch (e) {}
+
+ var result = nativeObjectToString.call(value);
+ if (unmasked) {
+ if (isOwn) {
+ value[symToStringTag] = tag;
+ } else {
+ delete value[symToStringTag];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of the own enumerable symbols of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of symbols.
+ */
+ var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
+ if (object == null) {
+ return [];
+ }
+ object = Object(object);
+ return arrayFilter(nativeGetSymbols(object), function(symbol) {
+ return propertyIsEnumerable.call(object, symbol);
+ });
+ };
+
+ /**
+ * Creates an array of the own and inherited enumerable symbols of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of symbols.
+ */
+ var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
+ var result = [];
+ while (object) {
+ arrayPush(result, getSymbols(object));
+ object = getPrototype(object);
+ }
+ return result;
+ };
+
+ /**
+ * Gets the \`toStringTag\` of \`value\`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the \`toStringTag\`.
+ */
+ var getTag = baseGetTag;
+
+ // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
+ if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
+ (Map && getTag(new Map) != mapTag) ||
+ (Promise && getTag(Promise.resolve()) != promiseTag) ||
+ (Set && getTag(new Set) != setTag) ||
+ (WeakMap && getTag(new WeakMap) != weakMapTag)) {
+ getTag = function(value) {
+ var result = baseGetTag(value),
+ Ctor = result == objectTag ? value.constructor : undefined,
+ ctorString = Ctor ? toSource(Ctor) : '';
+
+ if (ctorString) {
+ switch (ctorString) {
+ case dataViewCtorString: return dataViewTag;
+ case mapCtorString: return mapTag;
+ case promiseCtorString: return promiseTag;
+ case setCtorString: return setTag;
+ case weakMapCtorString: return weakMapTag;
+ }
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Gets the view, applying any \`transforms\` to the \`start\` and \`end\` positions.
+ *
+ * @private
+ * @param {number} start The start of the view.
+ * @param {number} end The end of the view.
+ * @param {Array} transforms The transformations to apply to the view.
+ * @returns {Object} Returns an object containing the \`start\` and \`end\`
+ * positions of the view.
+ */
+ function getView(start, end, transforms) {
+ var index = -1,
+ length = transforms.length;
+
+ while (++index < length) {
+ var data = transforms[index],
+ size = data.size;
+
+ switch (data.type) {
+ case 'drop': start += size; break;
+ case 'dropRight': end -= size; break;
+ case 'take': end = nativeMin(end, start + size); break;
+ case 'takeRight': start = nativeMax(start, end - size); break;
+ }
+ }
+ return { 'start': start, 'end': end };
+ }
+
+ /**
+ * Extracts wrapper details from the \`source\` body comment.
+ *
+ * @private
+ * @param {string} source The source to inspect.
+ * @returns {Array} Returns the wrapper details.
+ */
+ function getWrapDetails(source) {
+ var match = source.match(reWrapDetails);
+ return match ? match[1].split(reSplitDetails) : [];
+ }
+
+ /**
+ * Checks if \`path\` exists on \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @param {Function} hasFunc The function to check properties.
+ * @returns {boolean} Returns \`true\` if \`path\` exists, else \`false\`.
+ */
+ function hasPath(object, path, hasFunc) {
+ path = castPath(path, object);
+
+ var index = -1,
+ length = path.length,
+ result = false;
+
+ while (++index < length) {
+ var key = toKey(path[index]);
+ if (!(result = object != null && hasFunc(object, key))) {
+ break;
+ }
+ object = object[key];
+ }
+ if (result || ++index != length) {
+ return result;
+ }
+ length = object == null ? 0 : object.length;
+ return !!length && isLength(length) && isIndex(key, length) &&
+ (isArray(object) || isArguments(object));
+ }
+
+ /**
+ * Initializes an array clone.
+ *
+ * @private
+ * @param {Array} array The array to clone.
+ * @returns {Array} Returns the initialized clone.
+ */
+ function initCloneArray(array) {
+ var length = array.length,
+ result = new array.constructor(length);
+
+ // Add properties assigned by \`RegExp#exec\`.
+ if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+ result.index = array.index;
+ result.input = array.input;
+ }
+ return result;
+ }
+
+ /**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneObject(object) {
+ return (typeof object.constructor == 'function' && !isPrototype(object))
+ ? baseCreate(getPrototype(object))
+ : {};
+ }
+
+ /**
+ * Initializes an object clone based on its \`toStringTag\`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * \`Boolean\`, \`Date\`, \`Error\`, \`Map\`, \`Number\`, \`RegExp\`, \`Set\`, or \`String\`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The \`toStringTag\` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+ function initCloneByTag(object, tag, isDeep) {
+ var Ctor = object.constructor;
+ switch (tag) {
+ case arrayBufferTag:
+ return cloneArrayBuffer(object);
+
+ case boolTag:
+ case dateTag:
+ return new Ctor(+object);
+
+ case dataViewTag:
+ return cloneDataView(object, isDeep);
+
+ case float32Tag: case float64Tag:
+ case int8Tag: case int16Tag: case int32Tag:
+ case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+ return cloneTypedArray(object, isDeep);
+
+ case mapTag:
+ return new Ctor;
+
+ case numberTag:
+ case stringTag:
+ return new Ctor(object);
+
+ case regexpTag:
+ return cloneRegExp(object);
+
+ case setTag:
+ return new Ctor;
+
+ case symbolTag:
+ return cloneSymbol(object);
+ }
+ }
+
+ /**
+ * Inserts wrapper \`details\` in a comment at the top of the \`source\` body.
+ *
+ * @private
+ * @param {string} source The source to modify.
+ * @returns {Array} details The details to insert.
+ * @returns {string} Returns the modified source.
+ */
+ function insertWrapDetails(source, details) {
+ var length = details.length;
+ if (!length) {
+ return source;
+ }
+ var lastIndex = length - 1;
+ details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
+ details = details.join(length > 2 ? ', ' : ' ');
+ return source.replace(reWrapComment, '{\\\\n/* [wrapped with ' + details + '] */\\\\n');
+ }
+
+ /**
+ * Checks if \`value\` is a flattenable \`arguments\` object or array.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is flattenable, else \`false\`.
+ */
+ function isFlattenable(value) {
+ return isArray(value) || isArguments(value) ||
+ !!(spreadableSymbol && value && value[spreadableSymbol]);
+ }
+
+ /**
+ * Checks if \`value\` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns \`true\` if \`value\` is a valid index, else \`false\`.
+ */
+ function isIndex(value, length) {
+ var type = typeof value;
+ length = length == null ? MAX_SAFE_INTEGER : length;
+
+ return !!length &&
+ (type == 'number' ||
+ (type != 'symbol' && reIsUint.test(value))) &&
+ (value > -1 && value % 1 == 0 && value < length);
+ }
+
+ /**
+ * Checks if the given arguments are from an iteratee call.
+ *
+ * @private
+ * @param {*} value The potential iteratee value argument.
+ * @param {*} index The potential iteratee index or key argument.
+ * @param {*} object The potential iteratee object argument.
+ * @returns {boolean} Returns \`true\` if the arguments are from an iteratee call,
+ * else \`false\`.
+ */
+ function isIterateeCall(value, index, object) {
+ if (!isObject(object)) {
+ return false;
+ }
+ var type = typeof index;
+ if (type == 'number'
+ ? (isArrayLike(object) && isIndex(index, object.length))
+ : (type == 'string' && index in object)
+ ) {
+ return eq(object[index], value);
+ }
+ return false;
+ }
+
+ /**
+ * Checks if \`value\` is a property name and not a property path.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {Object} [object] The object to query keys on.
+ * @returns {boolean} Returns \`true\` if \`value\` is a property name, else \`false\`.
+ */
+ function isKey(value, object) {
+ if (isArray(value)) {
+ return false;
+ }
+ var type = typeof value;
+ if (type == 'number' || type == 'symbol' || type == 'boolean' ||
+ value == null || isSymbol(value)) {
+ return true;
+ }
+ return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+ (object != null && value in Object(object));
+ }
+
+ /**
+ * Checks if \`value\` is suitable for use as unique object key.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is suitable, else \`false\`.
+ */
+ function isKeyable(value) {
+ var type = typeof value;
+ return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+ ? (value !== '__proto__')
+ : (value === null);
+ }
+
+ /**
+ * Checks if \`func\` has a lazy counterpart.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns \`true\` if \`func\` has a lazy counterpart,
+ * else \`false\`.
+ */
+ function isLaziable(func) {
+ var funcName = getFuncName(func),
+ other = lodash[funcName];
+
+ if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
+ return false;
+ }
+ if (func === other) {
+ return true;
+ }
+ var data = getData(other);
+ return !!data && func === data[0];
+ }
+
+ /**
+ * Checks if \`func\` has its source masked.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns \`true\` if \`func\` is masked, else \`false\`.
+ */
+ function isMasked(func) {
+ return !!maskSrcKey && (maskSrcKey in func);
+ }
+
+ /**
+ * Checks if \`func\` is capable of being masked.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`func\` is maskable, else \`false\`.
+ */
+ var isMaskable = coreJsData ? isFunction : stubFalse;
+
+ /**
+ * Checks if \`value\` is likely a prototype object.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a prototype, else \`false\`.
+ */
+ function isPrototype(value) {
+ var Ctor = value && value.constructor,
+ proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
+
+ return value === proto;
+ }
+
+ /**
+ * Checks if \`value\` is suitable for strict equality comparisons, i.e. \`===\`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` if suitable for strict
+ * equality comparisons, else \`false\`.
+ */
+ function isStrictComparable(value) {
+ return value === value && !isObject(value);
+ }
+
+ /**
+ * A specialized version of \`matchesProperty\` for source values suitable
+ * for strict equality comparisons, i.e. \`===\`.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new spec function.
+ */
+ function matchesStrictComparable(key, srcValue) {
+ return function(object) {
+ if (object == null) {
+ return false;
+ }
+ return object[key] === srcValue &&
+ (srcValue !== undefined || (key in Object(object)));
+ };
+ }
+
+ /**
+ * A specialized version of \`_.memoize\` which clears the memoized function's
+ * cache when it exceeds \`MAX_MEMOIZE_SIZE\`.
+ *
+ * @private
+ * @param {Function} func The function to have its output memoized.
+ * @returns {Function} Returns the new memoized function.
+ */
+ function memoizeCapped(func) {
+ var result = memoize(func, function(key) {
+ if (cache.size === MAX_MEMOIZE_SIZE) {
+ cache.clear();
+ }
+ return key;
+ });
+
+ var cache = result.cache;
+ return result;
+ }
+
+ /**
+ * Merges the function metadata of \`source\` into \`data\`.
+ *
+ * Merging metadata reduces the number of wrappers used to invoke a function.
+ * This is possible because methods like \`_.bind\`, \`_.curry\`, and \`_.partial\`
+ * may be applied regardless of execution order. Methods like \`_.ary\` and
+ * \`_.rearg\` modify function arguments, making the order in which they are
+ * executed important, preventing the merging of metadata. However, we make
+ * an exception for a safe combined case where curried functions have \`_.ary\`
+ * and or \`_.rearg\` applied.
+ *
+ * @private
+ * @param {Array} data The destination metadata.
+ * @param {Array} source The source metadata.
+ * @returns {Array} Returns \`data\`.
+ */
+ function mergeData(data, source) {
+ var bitmask = data[1],
+ srcBitmask = source[1],
+ newBitmask = bitmask | srcBitmask,
+ isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
+
+ var isCombo =
+ ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
+ ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
+ ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
+
+ // Exit early if metadata can't be merged.
+ if (!(isCommon || isCombo)) {
+ return data;
+ }
+ // Use source \`thisArg\` if available.
+ if (srcBitmask & WRAP_BIND_FLAG) {
+ data[2] = source[2];
+ // Set when currying a bound function.
+ newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
+ }
+ // Compose partial arguments.
+ var value = source[3];
+ if (value) {
+ var partials = data[3];
+ data[3] = partials ? composeArgs(partials, value, source[4]) : value;
+ data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
+ }
+ // Compose partial right arguments.
+ value = source[5];
+ if (value) {
+ partials = data[5];
+ data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
+ data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
+ }
+ // Use source \`argPos\` if available.
+ value = source[7];
+ if (value) {
+ data[7] = value;
+ }
+ // Use source \`ary\` if it's smaller.
+ if (srcBitmask & WRAP_ARY_FLAG) {
+ data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
+ }
+ // Use source \`arity\` if one is not provided.
+ if (data[9] == null) {
+ data[9] = source[9];
+ }
+ // Use source \`func\` and merge bitmasks.
+ data[0] = source[0];
+ data[1] = newBitmask;
+
+ return data;
+ }
+
+ /**
+ * This function is like
+ * [\`Object.keys\`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+ * except that it includes inherited enumerable properties.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+ function nativeKeysIn(object) {
+ var result = [];
+ if (object != null) {
+ for (var key in Object(object)) {
+ result.push(key);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Converts \`value\` to a string using \`Object.prototype.toString\`.
+ *
+ * @private
+ * @param {*} value The value to convert.
+ * @returns {string} Returns the converted string.
+ */
+ function objectToString(value) {
+ return nativeObjectToString.call(value);
+ }
+
+ /**
+ * A specialized version of \`baseRest\` which transforms the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @param {Function} transform The rest array transform.
+ * @returns {Function} Returns the new function.
+ */
+ function overRest(func, start, transform) {
+ start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+ return function() {
+ var args = arguments,
+ index = -1,
+ length = nativeMax(args.length - start, 0),
+ array = Array(length);
+
+ while (++index < length) {
+ array[index] = args[start + index];
+ }
+ index = -1;
+ var otherArgs = Array(start + 1);
+ while (++index < start) {
+ otherArgs[index] = args[index];
+ }
+ otherArgs[start] = transform(array);
+ return apply(func, this, otherArgs);
+ };
+ }
+
+ /**
+ * Gets the parent value at \`path\` of \`object\`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array} path The path to get the parent value of.
+ * @returns {*} Returns the parent value.
+ */
+ function parent(object, path) {
+ return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
+ }
+
+ /**
+ * Reorder \`array\` according to the specified indexes where the element at
+ * the first index is assigned as the first element, the element at
+ * the second index is assigned as the second element, and so on.
+ *
+ * @private
+ * @param {Array} array The array to reorder.
+ * @param {Array} indexes The arranged array indexes.
+ * @returns {Array} Returns \`array\`.
+ */
+ function reorder(array, indexes) {
+ var arrLength = array.length,
+ length = nativeMin(indexes.length, arrLength),
+ oldArray = copyArray(array);
+
+ while (length--) {
+ var index = indexes[length];
+ array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
+ }
+ return array;
+ }
+
+ /**
+ * Gets the value at \`key\`, unless \`key\` is \\"__proto__\\" or \\"constructor\\".
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the property to get.
+ * @returns {*} Returns the property value.
+ */
+ function safeGet(object, key) {
+ if (key === 'constructor' && typeof object[key] === 'function') {
+ return;
+ }
+
+ if (key == '__proto__') {
+ return;
+ }
+
+ return object[key];
+ }
+
+ /**
+ * Sets metadata for \`func\`.
+ *
+ * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+ * period of time, it will trip its breaker and transition to an identity
+ * function to avoid garbage collection pauses in V8. See
+ * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
+ * for more details.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns \`func\`.
+ */
+ var setData = shortOut(baseSetData);
+
+ /**
+ * A simple wrapper around the global [\`setTimeout\`](https://mdn.io/setTimeout).
+ *
+ * @private
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @returns {number|Object} Returns the timer id or timeout object.
+ */
+ var setTimeout = ctxSetTimeout || function(func, wait) {
+ return root.setTimeout(func, wait);
+ };
+
+ /**
+ * Sets the \`toString\` method of \`func\` to return \`string\`.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The \`toString\` result.
+ * @returns {Function} Returns \`func\`.
+ */
+ var setToString = shortOut(baseSetToString);
+
+ /**
+ * Sets the \`toString\` method of \`wrapper\` to mimic the source of \`reference\`
+ * with wrapper details in a comment at the top of the source body.
+ *
+ * @private
+ * @param {Function} wrapper The function to modify.
+ * @param {Function} reference The reference function.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @returns {Function} Returns \`wrapper\`.
+ */
+ function setWrapToString(wrapper, reference, bitmask) {
+ var source = (reference + '');
+ return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+ }
+
+ /**
+ * Creates a function that'll short out and invoke \`identity\` instead
+ * of \`func\` when it's called \`HOT_COUNT\` or more times in \`HOT_SPAN\`
+ * milliseconds.
+ *
+ * @private
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new shortable function.
+ */
+ function shortOut(func) {
+ var count = 0,
+ lastCalled = 0;
+
+ return function() {
+ var stamp = nativeNow(),
+ remaining = HOT_SPAN - (stamp - lastCalled);
+
+ lastCalled = stamp;
+ if (remaining > 0) {
+ if (++count >= HOT_COUNT) {
+ return arguments[0];
+ }
+ } else {
+ count = 0;
+ }
+ return func.apply(undefined, arguments);
+ };
+ }
+
+ /**
+ * A specialized version of \`_.shuffle\` which mutates and sets the size of \`array\`.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @param {number} [size=array.length] The size of \`array\`.
+ * @returns {Array} Returns \`array\`.
+ */
+ function shuffleSelf(array, size) {
+ var index = -1,
+ length = array.length,
+ lastIndex = length - 1;
+
+ size = size === undefined ? length : size;
+ while (++index < size) {
+ var rand = baseRandom(index, lastIndex),
+ value = array[rand];
+
+ array[rand] = array[index];
+ array[index] = value;
+ }
+ array.length = size;
+ return array;
+ }
+
+ /**
+ * Converts \`string\` to a property path array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the property path array.
+ */
+ var stringToPath = memoizeCapped(function(string) {
+ var result = [];
+ if (string.charCodeAt(0) === 46 /* . */) {
+ result.push('');
+ }
+ string.replace(rePropName, function(match, number, quote, subString) {
+ result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
+ });
+ return result;
+ });
+
+ /**
+ * Converts \`value\` to a string key if it's not a string or symbol.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {string|symbol} Returns the key.
+ */
+ function toKey(value) {
+ if (typeof value == 'string' || isSymbol(value)) {
+ return value;
+ }
+ var result = (value + '');
+ return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+ }
+
+ /**
+ * Converts \`func\` to its source code.
+ *
+ * @private
+ * @param {Function} func The function to convert.
+ * @returns {string} Returns the source code.
+ */
+ function toSource(func) {
+ if (func != null) {
+ try {
+ return funcToString.call(func);
+ } catch (e) {}
+ try {
+ return (func + '');
+ } catch (e) {}
+ }
+ return '';
+ }
+
+ /**
+ * Updates wrapper \`details\` based on \`bitmask\` flags.
+ *
+ * @private
+ * @returns {Array} details The details to modify.
+ * @param {number} bitmask The bitmask flags. See \`createWrap\` for more details.
+ * @returns {Array} Returns \`details\`.
+ */
+ function updateWrapDetails(details, bitmask) {
+ arrayEach(wrapFlags, function(pair) {
+ var value = '_.' + pair[0];
+ if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
+ details.push(value);
+ }
+ });
+ return details.sort();
+ }
+
+ /**
+ * Creates a clone of \`wrapper\`.
+ *
+ * @private
+ * @param {Object} wrapper The wrapper to clone.
+ * @returns {Object} Returns the cloned wrapper.
+ */
+ function wrapperClone(wrapper) {
+ if (wrapper instanceof LazyWrapper) {
+ return wrapper.clone();
+ }
+ var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
+ result.__actions__ = copyArray(wrapper.__actions__);
+ result.__index__ = wrapper.__index__;
+ result.__values__ = wrapper.__values__;
+ return result;
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of elements split into groups the length of \`size\`.
+ * If \`array\` can't be split evenly, the final chunk will be the remaining
+ * elements.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to process.
+ * @param {number} [size=1] The length of each chunk
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the new array of chunks.
+ * @example
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 2);
+ * // => [['a', 'b'], ['c', 'd']]
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 3);
+ * // => [['a', 'b', 'c'], ['d']]
+ */
+ function chunk(array, size, guard) {
+ if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
+ size = 1;
+ } else {
+ size = nativeMax(toInteger(size), 0);
+ }
+ var length = array == null ? 0 : array.length;
+ if (!length || size < 1) {
+ return [];
+ }
+ var index = 0,
+ resIndex = 0,
+ result = Array(nativeCeil(length / size));
+
+ while (index < length) {
+ result[resIndex++] = baseSlice(array, index, (index += size));
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array with all falsey values removed. The values \`false\`, \`null\`,
+ * \`0\`, \`\\"\\"\`, \`undefined\`, and \`NaN\` are falsey.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to compact.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.compact([0, 1, false, 2, '', 3]);
+ * // => [1, 2, 3]
+ */
+ function compact(array) {
+ var index = -1,
+ length = array == null ? 0 : array.length,
+ resIndex = 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value) {
+ result[resIndex++] = value;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates a new array concatenating \`array\` with any additional arrays
+ * and/or values.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to concatenate.
+ * @param {...*} [values] The values to concatenate.
+ * @returns {Array} Returns the new concatenated array.
+ * @example
+ *
+ * var array = [1];
+ * var other = _.concat(array, 2, [3], [[4]]);
+ *
+ * console.log(other);
+ * // => [1, 2, 3, [4]]
+ *
+ * console.log(array);
+ * // => [1]
+ */
+ function concat() {
+ var length = arguments.length;
+ if (!length) {
+ return [];
+ }
+ var args = Array(length - 1),
+ array = arguments[0],
+ index = length;
+
+ while (index--) {
+ args[index - 1] = arguments[index];
+ }
+ return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
+ }
+
+ /**
+ * Creates an array of \`array\` values not included in the other given arrays
+ * using [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
+ *
+ * **Note:** Unlike \`_.pullAll\`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.without, _.xor
+ * @example
+ *
+ * _.difference([2, 1], [2, 3]);
+ * // => [1]
+ */
+ var difference = baseRest(function(array, values) {
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
+ : [];
+ });
+
+ /**
+ * This method is like \`_.difference\` except that it accepts \`iteratee\` which
+ * is invoked for each element of \`array\` and \`values\` to generate the criterion
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * **Note:** Unlike \`_.pullAllBy\`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [1.2]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
+ * // => [{ 'x': 2 }]
+ */
+ var differenceBy = baseRest(function(array, values) {
+ var iteratee = last(values);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
+ : [];
+ });
+
+ /**
+ * This method is like \`_.difference\` except that it accepts \`comparator\`
+ * which is invoked to compare elements of \`array\` to \`values\`. The order and
+ * references of result values are determined by the first array. The comparator
+ * is invoked with two arguments: (arrVal, othVal).
+ *
+ * **Note:** Unlike \`_.pullAllWith\`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The values to exclude.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ *
+ * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
+ * // => [{ 'x': 2, 'y': 1 }]
+ */
+ var differenceWith = baseRest(function(array, values) {
+ var comparator = last(values);
+ if (isArrayLikeObject(comparator)) {
+ comparator = undefined;
+ }
+ return isArrayLikeObject(array)
+ ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
+ : [];
+ });
+
+ /**
+ * Creates a slice of \`array\` with \`n\` elements dropped from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.drop([1, 2, 3]);
+ * // => [2, 3]
+ *
+ * _.drop([1, 2, 3], 2);
+ * // => [3]
+ *
+ * _.drop([1, 2, 3], 5);
+ * // => []
+ *
+ * _.drop([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function drop(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ return baseSlice(array, n < 0 ? 0 : n, length);
+ }
+
+ /**
+ * Creates a slice of \`array\` with \`n\` elements dropped from the end.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.dropRight([1, 2, 3]);
+ * // => [1, 2]
+ *
+ * _.dropRight([1, 2, 3], 2);
+ * // => [1]
+ *
+ * _.dropRight([1, 2, 3], 5);
+ * // => []
+ *
+ * _.dropRight([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+ function dropRight(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ n = length - n;
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of \`array\` excluding elements dropped from the end.
+ * Elements are dropped until \`predicate\` returns falsey. The predicate is
+ * invoked with three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.dropRightWhile(users, function(o) { return !o.active; });
+ * // => objects for ['barney']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
+ * // => objects for ['barney', 'fred']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.dropRightWhile(users, ['active', false]);
+ * // => objects for ['barney']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.dropRightWhile(users, 'active');
+ * // => objects for ['barney', 'fred', 'pebbles']
+ */
+ function dropRightWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), true, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of \`array\` excluding elements dropped from the beginning.
+ * Elements are dropped until \`predicate\` returns falsey. The predicate is
+ * invoked with three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.dropWhile(users, function(o) { return !o.active; });
+ * // => objects for ['pebbles']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.dropWhile(users, { 'user': 'barney', 'active': false });
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.dropWhile(users, ['active', false]);
+ * // => objects for ['pebbles']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.dropWhile(users, 'active');
+ * // => objects for ['barney', 'fred', 'pebbles']
+ */
+ function dropWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), true)
+ : [];
+ }
+
+ /**
+ * Fills elements of \`array\` with \`value\` from \`start\` up to, but not
+ * including, \`end\`.
+ *
+ * **Note:** This method mutates \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.2.0
+ * @category Array
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill \`array\` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _.fill(array, 'a');
+ * console.log(array);
+ * // => ['a', 'a', 'a']
+ *
+ * _.fill(Array(3), 2);
+ * // => [2, 2, 2]
+ *
+ * _.fill([4, 6, 8, 10], '*', 1, 3);
+ * // => [4, '*', '*', 10]
+ */
+ function fill(array, value, start, end) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+ start = 0;
+ end = length;
+ }
+ return baseFill(array, value, start, end);
+ }
+
+ /**
+ * This method is like \`_.find\` except that it returns the index of the first
+ * element \`predicate\` returns truthy for instead of the element itself.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {number} Returns the index of the found element, else \`-1\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.findIndex(users, function(o) { return o.user == 'barney'; });
+ * // => 0
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.findIndex(users, { 'user': 'fred', 'active': false });
+ * // => 1
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.findIndex(users, ['active', false]);
+ * // => 0
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.findIndex(users, 'active');
+ * // => 2
+ */
+ function findIndex(array, predicate, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = fromIndex == null ? 0 : toInteger(fromIndex);
+ if (index < 0) {
+ index = nativeMax(length + index, 0);
+ }
+ return baseFindIndex(array, getIteratee(predicate, 3), index);
+ }
+
+ /**
+ * This method is like \`_.findIndex\` except that it iterates over elements
+ * of \`collection\` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=array.length-1] The index to search from.
+ * @returns {number} Returns the index of the found element, else \`-1\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
+ * // => 2
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.findLastIndex(users, { 'user': 'barney', 'active': true });
+ * // => 0
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.findLastIndex(users, ['active', false]);
+ * // => 2
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.findLastIndex(users, 'active');
+ * // => 0
+ */
+ function findLastIndex(array, predicate, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = length - 1;
+ if (fromIndex !== undefined) {
+ index = toInteger(fromIndex);
+ index = fromIndex < 0
+ ? nativeMax(length + index, 0)
+ : nativeMin(index, length - 1);
+ }
+ return baseFindIndex(array, getIteratee(predicate, 3), index, true);
+ }
+
+ /**
+ * Flattens \`array\` a single level deep.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flatten([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, [3, [4]], 5]
+ */
+ function flatten(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseFlatten(array, 1) : [];
+ }
+
+ /**
+ * Recursively flattens \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flattenDeep([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, 3, 4, 5]
+ */
+ function flattenDeep(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseFlatten(array, INFINITY) : [];
+ }
+
+ /**
+ * Recursively flatten \`array\` up to \`depth\` times.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.4.0
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @param {number} [depth=1] The maximum recursion depth.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * var array = [1, [2, [3, [4]], 5]];
+ *
+ * _.flattenDepth(array, 1);
+ * // => [1, 2, [3, [4]], 5]
+ *
+ * _.flattenDepth(array, 2);
+ * // => [1, 2, 3, [4], 5]
+ */
+ function flattenDepth(array, depth) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ depth = depth === undefined ? 1 : toInteger(depth);
+ return baseFlatten(array, depth);
+ }
+
+ /**
+ * The inverse of \`_.toPairs\`; this method returns an object composed
+ * from key-value \`pairs\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} pairs The key-value pairs.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.fromPairs([['a', 1], ['b', 2]]);
+ * // => { 'a': 1, 'b': 2 }
+ */
+ function fromPairs(pairs) {
+ var index = -1,
+ length = pairs == null ? 0 : pairs.length,
+ result = {};
+
+ while (++index < length) {
+ var pair = pairs[index];
+ result[pair[0]] = pair[1];
+ }
+ return result;
+ }
+
+ /**
+ * Gets the first element of \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @alias first
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the first element of \`array\`.
+ * @example
+ *
+ * _.head([1, 2, 3]);
+ * // => 1
+ *
+ * _.head([]);
+ * // => undefined
+ */
+ function head(array) {
+ return (array && array.length) ? array[0] : undefined;
+ }
+
+ /**
+ * Gets the index at which the first occurrence of \`value\` is found in \`array\`
+ * using [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. If \`fromIndex\` is negative, it's used as the
+ * offset from the end of \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ * @example
+ *
+ * _.indexOf([1, 2, 1, 2], 2);
+ * // => 1
+ *
+ * // Search from the \`fromIndex\`.
+ * _.indexOf([1, 2, 1, 2], 2, 2);
+ * // => 3
+ */
+ function indexOf(array, value, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = fromIndex == null ? 0 : toInteger(fromIndex);
+ if (index < 0) {
+ index = nativeMax(length + index, 0);
+ }
+ return baseIndexOf(array, value, index);
+ }
+
+ /**
+ * Gets all but the last element of \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.initial([1, 2, 3]);
+ * // => [1, 2]
+ */
+ function initial(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseSlice(array, 0, -1) : [];
+ }
+
+ /**
+ * Creates an array of unique values that are included in all given arrays
+ * using [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * _.intersection([2, 1], [2, 3]);
+ * // => [2]
+ */
+ var intersection = baseRest(function(arrays) {
+ var mapped = arrayMap(arrays, castArrayLikeObject);
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped)
+ : [];
+ });
+
+ /**
+ * This method is like \`_.intersection\` except that it accepts \`iteratee\`
+ * which is invoked for each element of each \`arrays\` to generate the criterion
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [2.1]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }]
+ */
+ var intersectionBy = baseRest(function(arrays) {
+ var iteratee = last(arrays),
+ mapped = arrayMap(arrays, castArrayLikeObject);
+
+ if (iteratee === last(mapped)) {
+ iteratee = undefined;
+ } else {
+ mapped.pop();
+ }
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped, getIteratee(iteratee, 2))
+ : [];
+ });
+
+ /**
+ * This method is like \`_.intersection\` except that it accepts \`comparator\`
+ * which is invoked to compare elements of \`arrays\`. The order and references
+ * of result values are determined by the first array. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of intersecting values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.intersectionWith(objects, others, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }]
+ */
+ var intersectionWith = baseRest(function(arrays) {
+ var comparator = last(arrays),
+ mapped = arrayMap(arrays, castArrayLikeObject);
+
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ if (comparator) {
+ mapped.pop();
+ }
+ return (mapped.length && mapped[0] === arrays[0])
+ ? baseIntersection(mapped, undefined, comparator)
+ : [];
+ });
+
+ /**
+ * Converts all elements in \`array\` into a string separated by \`separator\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to convert.
+ * @param {string} [separator=','] The element separator.
+ * @returns {string} Returns the joined string.
+ * @example
+ *
+ * _.join(['a', 'b', 'c'], '~');
+ * // => 'a~b~c'
+ */
+ function join(array, separator) {
+ return array == null ? '' : nativeJoin.call(array, separator);
+ }
+
+ /**
+ * Gets the last element of \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the last element of \`array\`.
+ * @example
+ *
+ * _.last([1, 2, 3]);
+ * // => 3
+ */
+ function last(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? array[length - 1] : undefined;
+ }
+
+ /**
+ * This method is like \`_.indexOf\` except that it iterates over elements of
+ * \`array\` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=array.length-1] The index to search from.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 1, 2], 2);
+ * // => 3
+ *
+ * // Search from the \`fromIndex\`.
+ * _.lastIndexOf([1, 2, 1, 2], 2, 2);
+ * // => 1
+ */
+ function lastIndexOf(array, value, fromIndex) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return -1;
+ }
+ var index = length;
+ if (fromIndex !== undefined) {
+ index = toInteger(fromIndex);
+ index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
+ }
+ return value === value
+ ? strictLastIndexOf(array, value, index)
+ : baseFindIndex(array, baseIsNaN, index, true);
+ }
+
+ /**
+ * Gets the element at index \`n\` of \`array\`. If \`n\` is negative, the nth
+ * element from the end is returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.11.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=0] The index of the element to return.
+ * @returns {*} Returns the nth element of \`array\`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'd'];
+ *
+ * _.nth(array, 1);
+ * // => 'b'
+ *
+ * _.nth(array, -2);
+ * // => 'c';
+ */
+ function nth(array, n) {
+ return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
+ }
+
+ /**
+ * Removes all given values from \`array\` using
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * **Note:** Unlike \`_.without\`, this method mutates \`array\`. Use \`_.remove\`
+ * to remove elements from an array by predicate.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...*} [values] The values to remove.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+ *
+ * _.pull(array, 'a', 'c');
+ * console.log(array);
+ * // => ['b', 'b']
+ */
+ var pull = baseRest(pullAll);
+
+ /**
+ * This method is like \`_.pull\` except that it accepts an array of values to remove.
+ *
+ * **Note:** Unlike \`_.difference\`, this method mutates \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
+ *
+ * _.pullAll(array, ['a', 'c']);
+ * console.log(array);
+ * // => ['b', 'b']
+ */
+ function pullAll(array, values) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values)
+ : array;
+ }
+
+ /**
+ * This method is like \`_.pullAll\` except that it accepts \`iteratee\` which is
+ * invoked for each element of \`array\` and \`values\` to generate the criterion
+ * by which they're compared. The iteratee is invoked with one argument: (value).
+ *
+ * **Note:** Unlike \`_.differenceBy\`, this method mutates \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
+ *
+ * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
+ * console.log(array);
+ * // => [{ 'x': 2 }]
+ */
+ function pullAllBy(array, values, iteratee) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values, getIteratee(iteratee, 2))
+ : array;
+ }
+
+ /**
+ * This method is like \`_.pullAll\` except that it accepts \`comparator\` which
+ * is invoked to compare elements of \`array\` to \`values\`. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
+ *
+ * **Note:** Unlike \`_.differenceWith\`, this method mutates \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.6.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
+ *
+ * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
+ * console.log(array);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
+ */
+ function pullAllWith(array, values, comparator) {
+ return (array && array.length && values && values.length)
+ ? basePullAll(array, values, undefined, comparator)
+ : array;
+ }
+
+ /**
+ * Removes elements from \`array\` corresponding to \`indexes\` and returns an
+ * array of removed elements.
+ *
+ * **Note:** Unlike \`_.at\`, this method mutates \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...(number|number[])} [indexes] The indexes of elements to remove.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = ['a', 'b', 'c', 'd'];
+ * var pulled = _.pullAt(array, [1, 3]);
+ *
+ * console.log(array);
+ * // => ['a', 'c']
+ *
+ * console.log(pulled);
+ * // => ['b', 'd']
+ */
+ var pullAt = flatRest(function(array, indexes) {
+ var length = array == null ? 0 : array.length,
+ result = baseAt(array, indexes);
+
+ basePullAt(array, arrayMap(indexes, function(index) {
+ return isIndex(index, length) ? +index : index;
+ }).sort(compareAscending));
+
+ return result;
+ });
+
+ /**
+ * Removes all elements from \`array\` that \`predicate\` returns truthy for
+ * and returns an array of the removed elements. The predicate is invoked
+ * with three arguments: (value, index, array).
+ *
+ * **Note:** Unlike \`_.filter\`, this method mutates \`array\`. Use \`_.pull\`
+ * to pull elements from an array by value.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [1, 2, 3, 4];
+ * var evens = _.remove(array, function(n) {
+ * return n % 2 == 0;
+ * });
+ *
+ * console.log(array);
+ * // => [1, 3]
+ *
+ * console.log(evens);
+ * // => [2, 4]
+ */
+ function remove(array, predicate) {
+ var result = [];
+ if (!(array && array.length)) {
+ return result;
+ }
+ var index = -1,
+ indexes = [],
+ length = array.length;
+
+ predicate = getIteratee(predicate, 3);
+ while (++index < length) {
+ var value = array[index];
+ if (predicate(value, index, array)) {
+ result.push(value);
+ indexes.push(index);
+ }
+ }
+ basePullAt(array, indexes);
+ return result;
+ }
+
+ /**
+ * Reverses \`array\` so that the first element becomes the last, the second
+ * element becomes the second to last, and so on.
+ *
+ * **Note:** This method mutates \`array\` and is based on
+ * [\`Array#reverse\`](https://mdn.io/Array/reverse).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @returns {Array} Returns \`array\`.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _.reverse(array);
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+ function reverse(array) {
+ return array == null ? array : nativeReverse.call(array);
+ }
+
+ /**
+ * Creates a slice of \`array\` from \`start\` up to, but not including, \`end\`.
+ *
+ * **Note:** This method is used instead of
+ * [\`Array#slice\`](https://mdn.io/Array/slice) to ensure dense arrays are
+ * returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of \`array\`.
+ */
+ function slice(array, start, end) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
+ start = 0;
+ end = length;
+ }
+ else {
+ start = start == null ? 0 : toInteger(start);
+ end = end === undefined ? length : toInteger(end);
+ }
+ return baseSlice(array, start, end);
+ }
+
+ /**
+ * Uses a binary search to determine the lowest index at which \`value\`
+ * should be inserted into \`array\` in order to maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ * @example
+ *
+ * _.sortedIndex([30, 50], 40);
+ * // => 1
+ */
+ function sortedIndex(array, value) {
+ return baseSortedIndex(array, value);
+ }
+
+ /**
+ * This method is like \`_.sortedIndex\` except that it accepts \`iteratee\`
+ * which is invoked for \`value\` and each element of \`array\` to compute their
+ * sort ranking. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ * @example
+ *
+ * var objects = [{ 'x': 4 }, { 'x': 5 }];
+ *
+ * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+ * // => 0
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
+ * // => 0
+ */
+ function sortedIndexBy(array, value, iteratee) {
+ return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
+ }
+
+ /**
+ * This method is like \`_.indexOf\` except that it performs a binary
+ * search on a sorted \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ * @example
+ *
+ * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
+ * // => 1
+ */
+ function sortedIndexOf(array, value) {
+ var length = array == null ? 0 : array.length;
+ if (length) {
+ var index = baseSortedIndex(array, value);
+ if (index < length && eq(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * This method is like \`_.sortedIndex\` except that it returns the highest
+ * index at which \`value\` should be inserted into \`array\` in order to
+ * maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ * @example
+ *
+ * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
+ * // => 4
+ */
+ function sortedLastIndex(array, value) {
+ return baseSortedIndex(array, value, true);
+ }
+
+ /**
+ * This method is like \`_.sortedLastIndex\` except that it accepts \`iteratee\`
+ * which is invoked for \`value\` and each element of \`array\` to compute their
+ * sort ranking. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the index at which \`value\` should be inserted
+ * into \`array\`.
+ * @example
+ *
+ * var objects = [{ 'x': 4 }, { 'x': 5 }];
+ *
+ * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
+ * // => 1
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
+ * // => 1
+ */
+ function sortedLastIndexBy(array, value, iteratee) {
+ return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
+ }
+
+ /**
+ * This method is like \`_.lastIndexOf\` except that it performs a binary
+ * search on a sorted \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns the index of the matched value, else \`-1\`.
+ * @example
+ *
+ * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
+ * // => 3
+ */
+ function sortedLastIndexOf(array, value) {
+ var length = array == null ? 0 : array.length;
+ if (length) {
+ var index = baseSortedIndex(array, value, true) - 1;
+ if (eq(array[index], value)) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * This method is like \`_.uniq\` except that it's designed and optimized
+ * for sorted arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.sortedUniq([1, 1, 2]);
+ * // => [1, 2]
+ */
+ function sortedUniq(array) {
+ return (array && array.length)
+ ? baseSortedUniq(array)
+ : [];
+ }
+
+ /**
+ * This method is like \`_.uniqBy\` except that it's designed and optimized
+ * for sorted arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
+ * // => [1.1, 2.3]
+ */
+ function sortedUniqBy(array, iteratee) {
+ return (array && array.length)
+ ? baseSortedUniq(array, getIteratee(iteratee, 2))
+ : [];
+ }
+
+ /**
+ * Gets all but the first element of \`array\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.tail([1, 2, 3]);
+ * // => [2, 3]
+ */
+ function tail(array) {
+ var length = array == null ? 0 : array.length;
+ return length ? baseSlice(array, 1, length) : [];
+ }
+
+ /**
+ * Creates a slice of \`array\` with \`n\` elements taken from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.take([1, 2, 3]);
+ * // => [1]
+ *
+ * _.take([1, 2, 3], 2);
+ * // => [1, 2]
+ *
+ * _.take([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.take([1, 2, 3], 0);
+ * // => []
+ */
+ function take(array, n, guard) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ return baseSlice(array, 0, n < 0 ? 0 : n);
+ }
+
+ /**
+ * Creates a slice of \`array\` with \`n\` elements taken from the end.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * _.takeRight([1, 2, 3]);
+ * // => [3]
+ *
+ * _.takeRight([1, 2, 3], 2);
+ * // => [2, 3]
+ *
+ * _.takeRight([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.takeRight([1, 2, 3], 0);
+ * // => []
+ */
+ function takeRight(array, n, guard) {
+ var length = array == null ? 0 : array.length;
+ if (!length) {
+ return [];
+ }
+ n = (guard || n === undefined) ? 1 : toInteger(n);
+ n = length - n;
+ return baseSlice(array, n < 0 ? 0 : n, length);
+ }
+
+ /**
+ * Creates a slice of \`array\` with elements taken from the end. Elements are
+ * taken until \`predicate\` returns falsey. The predicate is invoked with
+ * three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': false }
+ * ];
+ *
+ * _.takeRightWhile(users, function(o) { return !o.active; });
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
+ * // => objects for ['pebbles']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.takeRightWhile(users, ['active', false]);
+ * // => objects for ['fred', 'pebbles']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.takeRightWhile(users, 'active');
+ * // => []
+ */
+ function takeRightWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3), false, true)
+ : [];
+ }
+
+ /**
+ * Creates a slice of \`array\` with elements taken from the beginning. Elements
+ * are taken until \`predicate\` returns falsey. The predicate is invoked with
+ * three arguments: (value, index, array).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the slice of \`array\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': false },
+ * { 'user': 'fred', 'active': false },
+ * { 'user': 'pebbles', 'active': true }
+ * ];
+ *
+ * _.takeWhile(users, function(o) { return !o.active; });
+ * // => objects for ['barney', 'fred']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.takeWhile(users, { 'user': 'barney', 'active': false });
+ * // => objects for ['barney']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.takeWhile(users, ['active', false]);
+ * // => objects for ['barney', 'fred']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.takeWhile(users, 'active');
+ * // => []
+ */
+ function takeWhile(array, predicate) {
+ return (array && array.length)
+ ? baseWhile(array, getIteratee(predicate, 3))
+ : [];
+ }
+
+ /**
+ * Creates an array of unique values, in order, from all given arrays using
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.union([2], [1, 2]);
+ * // => [2, 1]
+ */
+ var union = baseRest(function(arrays) {
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
+ });
+
+ /**
+ * This method is like \`_.union\` except that it accepts \`iteratee\` which is
+ * invoked for each element of each \`arrays\` to generate the criterion by
+ * which uniqueness is computed. Result values are chosen from the first
+ * array in which the value occurs. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.unionBy([2.1], [1.2, 2.3], Math.floor);
+ * // => [2.1, 1.2]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ var unionBy = baseRest(function(arrays) {
+ var iteratee = last(arrays);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
+ });
+
+ /**
+ * This method is like \`_.union\` except that it accepts \`comparator\` which
+ * is invoked to compare elements of \`arrays\`. Result values are chosen from
+ * the first array in which the value occurs. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.unionWith(objects, others, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+ */
+ var unionWith = baseRest(function(arrays) {
+ var comparator = last(arrays);
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
+ });
+
+ /**
+ * Creates a duplicate-free version of an array, using
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons, in which only the first occurrence of each element
+ * is kept. The order of result values is determined by the order they occur
+ * in the array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.uniq([2, 1, 2]);
+ * // => [2, 1]
+ */
+ function uniq(array) {
+ return (array && array.length) ? baseUniq(array) : [];
+ }
+
+ /**
+ * This method is like \`_.uniq\` except that it accepts \`iteratee\` which is
+ * invoked for each element in \`array\` to generate the criterion by which
+ * uniqueness is computed. The order of result values is determined by the
+ * order they occur in the array. The iteratee is invoked with one argument:
+ * (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
+ * // => [2.1, 1.2]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ function uniqBy(array, iteratee) {
+ return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
+ }
+
+ /**
+ * This method is like \`_.uniq\` except that it accepts \`comparator\` which
+ * is invoked to compare elements of \`array\`. The order of result values is
+ * determined by the order they occur in the array.The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new duplicate free array.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.uniqWith(objects, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
+ */
+ function uniqWith(array, comparator) {
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
+ }
+
+ /**
+ * This method is like \`_.zip\` except that it accepts an array of grouped
+ * elements and creates an array regrouping the elements to their pre-zip
+ * configuration.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.2.0
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
+ * // => [['a', 1, true], ['b', 2, false]]
+ *
+ * _.unzip(zipped);
+ * // => [['a', 'b'], [1, 2], [true, false]]
+ */
+ function unzip(array) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ var length = 0;
+ array = arrayFilter(array, function(group) {
+ if (isArrayLikeObject(group)) {
+ length = nativeMax(group.length, length);
+ return true;
+ }
+ });
+ return baseTimes(length, function(index) {
+ return arrayMap(array, baseProperty(index));
+ });
+ }
+
+ /**
+ * This method is like \`_.unzip\` except that it accepts \`iteratee\` to specify
+ * how regrouped values should be combined. The iteratee is invoked with the
+ * elements of each group: (...group).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.8.0
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @param {Function} [iteratee=_.identity] The function to combine
+ * regrouped values.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
+ * // => [[1, 10, 100], [2, 20, 200]]
+ *
+ * _.unzipWith(zipped, _.add);
+ * // => [3, 30, 300]
+ */
+ function unzipWith(array, iteratee) {
+ if (!(array && array.length)) {
+ return [];
+ }
+ var result = unzip(array);
+ if (iteratee == null) {
+ return result;
+ }
+ return arrayMap(result, function(group) {
+ return apply(iteratee, undefined, group);
+ });
+ }
+
+ /**
+ * Creates an array excluding all given values using
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * **Note:** Unlike \`_.pull\`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...*} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.difference, _.xor
+ * @example
+ *
+ * _.without([2, 1, 2, 3], 1, 2);
+ * // => [3]
+ */
+ var without = baseRest(function(array, values) {
+ return isArrayLikeObject(array)
+ ? baseDifference(array, values)
+ : [];
+ });
+
+ /**
+ * Creates an array of unique values that is the
+ * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
+ * of the given arrays. The order of result values is determined by the order
+ * they occur in the arrays.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.4.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of filtered values.
+ * @see _.difference, _.without
+ * @example
+ *
+ * _.xor([2, 1], [2, 3]);
+ * // => [1, 3]
+ */
+ var xor = baseRest(function(arrays) {
+ return baseXor(arrayFilter(arrays, isArrayLikeObject));
+ });
+
+ /**
+ * This method is like \`_.xor\` except that it accepts \`iteratee\` which is
+ * invoked for each element of each \`arrays\` to generate the criterion by
+ * which by which they're compared. The order of result values is determined
+ * by the order they occur in the arrays. The iteratee is invoked with one
+ * argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
+ * // => [1.2, 3.4]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 2 }]
+ */
+ var xorBy = baseRest(function(arrays) {
+ var iteratee = last(arrays);
+ if (isArrayLikeObject(iteratee)) {
+ iteratee = undefined;
+ }
+ return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
+ });
+
+ /**
+ * This method is like \`_.xor\` except that it accepts \`comparator\` which is
+ * invoked to compare elements of \`arrays\`. The order of result values is
+ * determined by the order they occur in the arrays. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.xorWith(objects, others, _.isEqual);
+ * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
+ */
+ var xorWith = baseRest(function(arrays) {
+ var comparator = last(arrays);
+ comparator = typeof comparator == 'function' ? comparator : undefined;
+ return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
+ });
+
+ /**
+ * Creates an array of grouped elements, the first of which contains the
+ * first elements of the given arrays, the second of which contains the
+ * second elements of the given arrays, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zip(['a', 'b'], [1, 2], [true, false]);
+ * // => [['a', 1, true], ['b', 2, false]]
+ */
+ var zip = baseRest(unzip);
+
+ /**
+ * This method is like \`_.fromPairs\` except that it accepts two arrays,
+ * one of property identifiers and one of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.4.0
+ * @category Array
+ * @param {Array} [props=[]] The property identifiers.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObject(['a', 'b'], [1, 2]);
+ * // => { 'a': 1, 'b': 2 }
+ */
+ function zipObject(props, values) {
+ return baseZipObject(props || [], values || [], assignValue);
+ }
+
+ /**
+ * This method is like \`_.zipObject\` except that it supports property paths.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.1.0
+ * @category Array
+ * @param {Array} [props=[]] The property identifiers.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
+ * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
+ */
+ function zipObjectDeep(props, values) {
+ return baseZipObject(props || [], values || [], baseSet);
+ }
+
+ /**
+ * This method is like \`_.zip\` except that it accepts \`iteratee\` to specify
+ * how grouped values should be combined. The iteratee is invoked with the
+ * elements of each group: (...group).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.8.0
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @param {Function} [iteratee=_.identity] The function to combine
+ * grouped values.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
+ * return a + b + c;
+ * });
+ * // => [111, 222]
+ */
+ var zipWith = baseRest(function(arrays) {
+ var length = arrays.length,
+ iteratee = length > 1 ? arrays[length - 1] : undefined;
+
+ iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
+ return unzipWith(arrays, iteratee);
+ });
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates a \`lodash\` wrapper instance that wraps \`value\` with explicit method
+ * chain sequences enabled. The result of such sequences must be unwrapped
+ * with \`_#value\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.3.0
+ * @category Seq
+ * @param {*} value The value to wrap.
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'pebbles', 'age': 1 }
+ * ];
+ *
+ * var youngest = _
+ * .chain(users)
+ * .sortBy('age')
+ * .map(function(o) {
+ * return o.user + ' is ' + o.age;
+ * })
+ * .head()
+ * .value();
+ * // => 'pebbles is 1'
+ */
+ function chain(value) {
+ var result = lodash(value);
+ result.__chain__ = true;
+ return result;
+ }
+
+ /**
+ * This method invokes \`interceptor\` and returns \`value\`. The interceptor
+ * is invoked with one argument; (value). The purpose of this method is to
+ * \\"tap into\\" a method chain sequence in order to modify intermediate results.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @param {*} value The value to provide to \`interceptor\`.
+ * @param {Function} interceptor The function to invoke.
+ * @returns {*} Returns \`value\`.
+ * @example
+ *
+ * _([1, 2, 3])
+ * .tap(function(array) {
+ * // Mutate input array.
+ * array.pop();
+ * })
+ * .reverse()
+ * .value();
+ * // => [2, 1]
+ */
+ function tap(value, interceptor) {
+ interceptor(value);
+ return value;
+ }
+
+ /**
+ * This method is like \`_.tap\` except that it returns the result of \`interceptor\`.
+ * The purpose of this method is to \\"pass thru\\" values replacing intermediate
+ * results in a method chain sequence.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Seq
+ * @param {*} value The value to provide to \`interceptor\`.
+ * @param {Function} interceptor The function to invoke.
+ * @returns {*} Returns the result of \`interceptor\`.
+ * @example
+ *
+ * _(' abc ')
+ * .chain()
+ * .trim()
+ * .thru(function(value) {
+ * return [value];
+ * })
+ * .value();
+ * // => ['abc']
+ */
+ function thru(value, interceptor) {
+ return interceptor(value);
+ }
+
+ /**
+ * This method is the wrapper version of \`_.at\`.
+ *
+ * @name at
+ * @memberOf _
+ * @since 1.0.0
+ * @category Seq
+ * @param {...(string|string[])} [paths] The property paths to pick.
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+ *
+ * _(object).at(['a[0].b.c', 'a[1]']).value();
+ * // => [3, 4]
+ */
+ var wrapperAt = flatRest(function(paths) {
+ var length = paths.length,
+ start = length ? paths[0] : 0,
+ value = this.__wrapped__,
+ interceptor = function(object) { return baseAt(object, paths); };
+
+ if (length > 1 || this.__actions__.length ||
+ !(value instanceof LazyWrapper) || !isIndex(start)) {
+ return this.thru(interceptor);
+ }
+ value = value.slice(start, +start + (length ? 1 : 0));
+ value.__actions__.push({
+ 'func': thru,
+ 'args': [interceptor],
+ 'thisArg': undefined
+ });
+ return new LodashWrapper(value, this.__chain__).thru(function(array) {
+ if (length && !array.length) {
+ array.push(undefined);
+ }
+ return array;
+ });
+ });
+
+ /**
+ * Creates a \`lodash\` wrapper instance with explicit method chain sequences enabled.
+ *
+ * @name chain
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 }
+ * ];
+ *
+ * // A sequence without explicit chaining.
+ * _(users).head();
+ * // => { 'user': 'barney', 'age': 36 }
+ *
+ * // A sequence with explicit chaining.
+ * _(users)
+ * .chain()
+ * .head()
+ * .pick('user')
+ * .value();
+ * // => { 'user': 'barney' }
+ */
+ function wrapperChain() {
+ return chain(this);
+ }
+
+ /**
+ * Executes the chain sequence and returns the wrapped result.
+ *
+ * @name commit
+ * @memberOf _
+ * @since 3.2.0
+ * @category Seq
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapped = _(array).push(3);
+ *
+ * console.log(array);
+ * // => [1, 2]
+ *
+ * wrapped = wrapped.commit();
+ * console.log(array);
+ * // => [1, 2, 3]
+ *
+ * wrapped.last();
+ * // => 3
+ *
+ * console.log(array);
+ * // => [1, 2, 3]
+ */
+ function wrapperCommit() {
+ return new LodashWrapper(this.value(), this.__chain__);
+ }
+
+ /**
+ * Gets the next value on a wrapped object following the
+ * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
+ *
+ * @name next
+ * @memberOf _
+ * @since 4.0.0
+ * @category Seq
+ * @returns {Object} Returns the next iterator value.
+ * @example
+ *
+ * var wrapped = _([1, 2]);
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 1 }
+ *
+ * wrapped.next();
+ * // => { 'done': false, 'value': 2 }
+ *
+ * wrapped.next();
+ * // => { 'done': true, 'value': undefined }
+ */
+ function wrapperNext() {
+ if (this.__values__ === undefined) {
+ this.__values__ = toArray(this.value());
+ }
+ var done = this.__index__ >= this.__values__.length,
+ value = done ? undefined : this.__values__[this.__index__++];
+
+ return { 'done': done, 'value': value };
+ }
+
+ /**
+ * Enables the wrapper to be iterable.
+ *
+ * @name Symbol.iterator
+ * @memberOf _
+ * @since 4.0.0
+ * @category Seq
+ * @returns {Object} Returns the wrapper object.
+ * @example
+ *
+ * var wrapped = _([1, 2]);
+ *
+ * wrapped[Symbol.iterator]() === wrapped;
+ * // => true
+ *
+ * Array.from(wrapped);
+ * // => [1, 2]
+ */
+ function wrapperToIterator() {
+ return this;
+ }
+
+ /**
+ * Creates a clone of the chain sequence planting \`value\` as the wrapped value.
+ *
+ * @name plant
+ * @memberOf _
+ * @since 3.2.0
+ * @category Seq
+ * @param {*} value The value to plant.
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var wrapped = _([1, 2]).map(square);
+ * var other = wrapped.plant([3, 4]);
+ *
+ * other.value();
+ * // => [9, 16]
+ *
+ * wrapped.value();
+ * // => [1, 4]
+ */
+ function wrapperPlant(value) {
+ var result,
+ parent = this;
+
+ while (parent instanceof baseLodash) {
+ var clone = wrapperClone(parent);
+ clone.__index__ = 0;
+ clone.__values__ = undefined;
+ if (result) {
+ previous.__wrapped__ = clone;
+ } else {
+ result = clone;
+ }
+ var previous = clone;
+ parent = parent.__wrapped__;
+ }
+ previous.__wrapped__ = value;
+ return result;
+ }
+
+ /**
+ * This method is the wrapper version of \`_.reverse\`.
+ *
+ * **Note:** This method mutates the wrapped array.
+ *
+ * @name reverse
+ * @memberOf _
+ * @since 0.1.0
+ * @category Seq
+ * @returns {Object} Returns the new \`lodash\` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _(array).reverse().value()
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+ function wrapperReverse() {
+ var value = this.__wrapped__;
+ if (value instanceof LazyWrapper) {
+ var wrapped = value;
+ if (this.__actions__.length) {
+ wrapped = new LazyWrapper(this);
+ }
+ wrapped = wrapped.reverse();
+ wrapped.__actions__.push({
+ 'func': thru,
+ 'args': [reverse],
+ 'thisArg': undefined
+ });
+ return new LodashWrapper(wrapped, this.__chain__);
+ }
+ return this.thru(reverse);
+ }
+
+ /**
+ * Executes the chain sequence to resolve the unwrapped value.
+ *
+ * @name value
+ * @memberOf _
+ * @since 0.1.0
+ * @alias toJSON, valueOf
+ * @category Seq
+ * @returns {*} Returns the resolved unwrapped value.
+ * @example
+ *
+ * _([1, 2, 3]).value();
+ * // => [1, 2, 3]
+ */
+ function wrapperValue() {
+ return baseWrapperValue(this.__wrapped__, this.__actions__);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of \`collection\` thru \`iteratee\`. The corresponding value of
+ * each key is the number of times the key was returned by \`iteratee\`. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': 1, '6': 2 }
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ var countBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ ++result[key];
+ } else {
+ baseAssignValue(result, key, 1);
+ }
+ });
+
+ /**
+ * Checks if \`predicate\` returns truthy for **all** elements of \`collection\`.
+ * Iteration is stopped once \`predicate\` returns falsey. The predicate is
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * **Note:** This method returns \`true\` for
+ * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
+ * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
+ * elements of empty collections.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {boolean} Returns \`true\` if all elements pass the predicate check,
+ * else \`false\`.
+ * @example
+ *
+ * _.every([true, 1, null, 'yes'], Boolean);
+ * // => false
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.every(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.every(users, ['active', false]);
+ * // => true
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.every(users, 'active');
+ * // => false
+ */
+ function every(collection, predicate, guard) {
+ var func = isArray(collection) ? arrayEvery : baseEvery;
+ if (guard && isIterateeCall(collection, predicate, guard)) {
+ predicate = undefined;
+ }
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Iterates over elements of \`collection\`, returning an array of all elements
+ * \`predicate\` returns truthy for. The predicate is invoked with three
+ * arguments: (value, index|key, collection).
+ *
+ * **Note:** Unlike \`_.remove\`, this method returns a new array.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ * @see _.reject
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false }
+ * ];
+ *
+ * _.filter(users, function(o) { return !o.active; });
+ * // => objects for ['fred']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.filter(users, { 'age': 36, 'active': true });
+ * // => objects for ['barney']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.filter(users, ['active', false]);
+ * // => objects for ['fred']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.filter(users, 'active');
+ * // => objects for ['barney']
+ */
+ function filter(collection, predicate) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Iterates over elements of \`collection\`, returning the first element
+ * \`predicate\` returns truthy for. The predicate is invoked with three
+ * arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {*} Returns the matched element, else \`undefined\`.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': true },
+ * { 'user': 'fred', 'age': 40, 'active': false },
+ * { 'user': 'pebbles', 'age': 1, 'active': true }
+ * ];
+ *
+ * _.find(users, function(o) { return o.age < 40; });
+ * // => object for 'barney'
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.find(users, { 'age': 1, 'active': true });
+ * // => object for 'pebbles'
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.find(users, ['active', false]);
+ * // => object for 'fred'
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.find(users, 'active');
+ * // => object for 'barney'
+ */
+ var find = createFind(findIndex);
+
+ /**
+ * This method is like \`_.find\` except that it iterates over elements of
+ * \`collection\` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param {number} [fromIndex=collection.length-1] The index to search from.
+ * @returns {*} Returns the matched element, else \`undefined\`.
+ * @example
+ *
+ * _.findLast([1, 2, 3, 4], function(n) {
+ * return n % 2 == 1;
+ * });
+ * // => 3
+ */
+ var findLast = createFind(findLastIndex);
+
+ /**
+ * Creates a flattened array of values by running each element in \`collection\`
+ * thru \`iteratee\` and flattening the mapped results. The iteratee is invoked
+ * with three arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [n, n];
+ * }
+ *
+ * _.flatMap([1, 2], duplicate);
+ * // => [1, 1, 2, 2]
+ */
+ function flatMap(collection, iteratee) {
+ return baseFlatten(map(collection, iteratee), 1);
+ }
+
+ /**
+ * This method is like \`_.flatMap\` except that it recursively flattens the
+ * mapped results.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.7.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [[[n, n]]];
+ * }
+ *
+ * _.flatMapDeep([1, 2], duplicate);
+ * // => [1, 1, 2, 2]
+ */
+ function flatMapDeep(collection, iteratee) {
+ return baseFlatten(map(collection, iteratee), INFINITY);
+ }
+
+ /**
+ * This method is like \`_.flatMap\` except that it recursively flattens the
+ * mapped results up to \`depth\` times.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.7.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {number} [depth=1] The maximum recursion depth.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * function duplicate(n) {
+ * return [[[n, n]]];
+ * }
+ *
+ * _.flatMapDepth([1, 2], duplicate, 2);
+ * // => [[1, 1], [2, 2]]
+ */
+ function flatMapDepth(collection, iteratee, depth) {
+ depth = depth === undefined ? 1 : toInteger(depth);
+ return baseFlatten(map(collection, iteratee), depth);
+ }
+
+ /**
+ * Iterates over elements of \`collection\` and invokes \`iteratee\` for each element.
+ * The iteratee is invoked with three arguments: (value, index|key, collection).
+ * Iteratee functions may exit iteration early by explicitly returning \`false\`.
+ *
+ * **Note:** As with other \\"Collections\\" methods, objects with a \\"length\\"
+ * property are iterated like arrays. To avoid this behavior use \`_.forIn\`
+ * or \`_.forOwn\` for object iteration.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @alias each
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array|Object} Returns \`collection\`.
+ * @see _.forEachRight
+ * @example
+ *
+ * _.forEach([1, 2], function(value) {
+ * console.log(value);
+ * });
+ * // => Logs \`1\` then \`2\`.
+ *
+ * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'a' then 'b' (iteration order is not guaranteed).
+ */
+ function forEach(collection, iteratee) {
+ var func = isArray(collection) ? arrayEach : baseEach;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * This method is like \`_.forEach\` except that it iterates over elements of
+ * \`collection\` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @alias eachRight
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array|Object} Returns \`collection\`.
+ * @see _.forEach
+ * @example
+ *
+ * _.forEachRight([1, 2], function(value) {
+ * console.log(value);
+ * });
+ * // => Logs \`2\` then \`1\`.
+ */
+ function forEachRight(collection, iteratee) {
+ var func = isArray(collection) ? arrayEachRight : baseEachRight;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of \`collection\` thru \`iteratee\`. The order of grouped values
+ * is determined by the order they occur in \`collection\`. The corresponding
+ * value of each key is an array of elements responsible for generating the
+ * key. The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.groupBy([6.1, 4.2, 6.3], Math.floor);
+ * // => { '4': [4.2], '6': [6.1, 6.3] }
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.groupBy(['one', 'two', 'three'], 'length');
+ * // => { '3': ['one', 'two'], '5': ['three'] }
+ */
+ var groupBy = createAggregator(function(result, value, key) {
+ if (hasOwnProperty.call(result, key)) {
+ result[key].push(value);
+ } else {
+ baseAssignValue(result, key, [value]);
+ }
+ });
+
+ /**
+ * Checks if \`value\` is in \`collection\`. If \`collection\` is a string, it's
+ * checked for a substring of \`value\`, otherwise
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * is used for equality comparisons. If \`fromIndex\` is negative, it's used as
+ * the offset from the end of \`collection\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.reduce\`.
+ * @returns {boolean} Returns \`true\` if \`value\` is found, else \`false\`.
+ * @example
+ *
+ * _.includes([1, 2, 3], 1);
+ * // => true
+ *
+ * _.includes([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * _.includes({ 'a': 1, 'b': 2 }, 1);
+ * // => true
+ *
+ * _.includes('abcd', 'bc');
+ * // => true
+ */
+ function includes(collection, value, fromIndex, guard) {
+ collection = isArrayLike(collection) ? collection : values(collection);
+ fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
+
+ var length = collection.length;
+ if (fromIndex < 0) {
+ fromIndex = nativeMax(length + fromIndex, 0);
+ }
+ return isString(collection)
+ ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
+ : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
+ }
+
+ /**
+ * Invokes the method at \`path\` of each element in \`collection\`, returning
+ * an array of the results of each invoked method. Any additional arguments
+ * are provided to each invoked method. If \`path\` is a function, it's invoked
+ * for, and \`this\` bound to, each element in \`collection\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Array|Function|string} path The path of the method to invoke or
+ * the function invoked per iteration.
+ * @param {...*} [args] The arguments to invoke each method with.
+ * @returns {Array} Returns the array of results.
+ * @example
+ *
+ * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
+ * // => [[1, 5, 7], [1, 2, 3]]
+ *
+ * _.invokeMap([123, 456], String.prototype.split, '');
+ * // => [['1', '2', '3'], ['4', '5', '6']]
+ */
+ var invokeMap = baseRest(function(collection, path, args) {
+ var index = -1,
+ isFunc = typeof path == 'function',
+ result = isArrayLike(collection) ? Array(collection.length) : [];
+
+ baseEach(collection, function(value) {
+ result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
+ });
+ return result;
+ });
+
+ /**
+ * Creates an object composed of keys generated from the results of running
+ * each element of \`collection\` thru \`iteratee\`. The corresponding value of
+ * each key is the last element responsible for generating the key. The
+ * iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * var array = [
+ * { 'dir': 'left', 'code': 97 },
+ * { 'dir': 'right', 'code': 100 }
+ * ];
+ *
+ * _.keyBy(array, function(o) {
+ * return String.fromCharCode(o.code);
+ * });
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.keyBy(array, 'dir');
+ * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+ */
+ var keyBy = createAggregator(function(result, value, key) {
+ baseAssignValue(result, key, value);
+ });
+
+ /**
+ * Creates an array of values by running each element in \`collection\` thru
+ * \`iteratee\`. The iteratee is invoked with three arguments:
+ * (value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * \`_.every\`, \`_.filter\`, \`_.map\`, \`_.mapValues\`, \`_.reject\`, and \`_.some\`.
+ *
+ * The guarded methods are:
+ * \`ary\`, \`chunk\`, \`curry\`, \`curryRight\`, \`drop\`, \`dropRight\`, \`every\`,
+ * \`fill\`, \`invert\`, \`parseInt\`, \`random\`, \`range\`, \`rangeRight\`, \`repeat\`,
+ * \`sampleSize\`, \`slice\`, \`some\`, \`sortBy\`, \`split\`, \`take\`, \`takeRight\`,
+ * \`template\`, \`trim\`, \`trimEnd\`, \`trimStart\`, and \`words\`
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * _.map([4, 8], square);
+ * // => [16, 64]
+ *
+ * _.map({ 'a': 4, 'b': 8 }, square);
+ * // => [16, 64] (iteration order is not guaranteed)
+ *
+ * var users = [
+ * { 'user': 'barney' },
+ * { 'user': 'fred' }
+ * ];
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.map(users, 'user');
+ * // => ['barney', 'fred']
+ */
+ function map(collection, iteratee) {
+ var func = isArray(collection) ? arrayMap : baseMap;
+ return func(collection, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * This method is like \`_.sortBy\` except that it allows specifying the sort
+ * orders of the iteratees to sort by. If \`orders\` is unspecified, all values
+ * are sorted in ascending order. Otherwise, specify an order of \\"desc\\" for
+ * descending or \\"asc\\" for ascending sort order of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
+ * The iteratees to sort by.
+ * @param {string[]} [orders] The sort orders of \`iteratees\`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.reduce\`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 34 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'barney', 'age': 36 }
+ * ];
+ *
+ * // Sort by \`user\` in ascending order and by \`age\` in descending order.
+ * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
+ * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
+ */
+ function orderBy(collection, iteratees, orders, guard) {
+ if (collection == null) {
+ return [];
+ }
+ if (!isArray(iteratees)) {
+ iteratees = iteratees == null ? [] : [iteratees];
+ }
+ orders = guard ? undefined : orders;
+ if (!isArray(orders)) {
+ orders = orders == null ? [] : [orders];
+ }
+ return baseOrderBy(collection, iteratees, orders);
+ }
+
+ /**
+ * Creates an array of elements split into two groups, the first of which
+ * contains elements \`predicate\` returns truthy for, the second of which
+ * contains elements \`predicate\` returns falsey for. The predicate is
+ * invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the array of grouped elements.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true },
+ * { 'user': 'pebbles', 'age': 1, 'active': false }
+ * ];
+ *
+ * _.partition(users, function(o) { return o.active; });
+ * // => objects for [['fred'], ['barney', 'pebbles']]
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.partition(users, { 'age': 1, 'active': false });
+ * // => objects for [['pebbles'], ['barney', 'fred']]
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.partition(users, ['active', false]);
+ * // => objects for [['barney', 'pebbles'], ['fred']]
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.partition(users, 'active');
+ * // => objects for [['fred'], ['barney', 'pebbles']]
+ */
+ var partition = createAggregator(function(result, value, key) {
+ result[key ? 0 : 1].push(value);
+ }, function() { return [[], []]; });
+
+ /**
+ * Reduces \`collection\` to a value which is the accumulated result of running
+ * each element in \`collection\` thru \`iteratee\`, where each successive
+ * invocation is supplied the return value of the previous. If \`accumulator\`
+ * is not given, the first element of \`collection\` is used as the initial
+ * value. The iteratee is invoked with four arguments:
+ * (accumulator, value, index|key, collection).
+ *
+ * Many lodash methods are guarded to work as iteratees for methods like
+ * \`_.reduce\`, \`_.reduceRight\`, and \`_.transform\`.
+ *
+ * The guarded methods are:
+ * \`assign\`, \`defaults\`, \`defaultsDeep\`, \`includes\`, \`merge\`, \`orderBy\`,
+ * and \`sortBy\`
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @returns {*} Returns the accumulated value.
+ * @see _.reduceRight
+ * @example
+ *
+ * _.reduce([1, 2], function(sum, n) {
+ * return sum + n;
+ * }, 0);
+ * // => 3
+ *
+ * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+ * (result[value] || (result[value] = [])).push(key);
+ * return result;
+ * }, {});
+ * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
+ */
+ function reduce(collection, iteratee, accumulator) {
+ var func = isArray(collection) ? arrayReduce : baseReduce,
+ initAccum = arguments.length < 3;
+
+ return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
+ }
+
+ /**
+ * This method is like \`_.reduce\` except that it iterates over elements of
+ * \`collection\` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @returns {*} Returns the accumulated value.
+ * @see _.reduce
+ * @example
+ *
+ * var array = [[0, 1], [2, 3], [4, 5]];
+ *
+ * _.reduceRight(array, function(flattened, other) {
+ * return flattened.concat(other);
+ * }, []);
+ * // => [4, 5, 2, 3, 0, 1]
+ */
+ function reduceRight(collection, iteratee, accumulator) {
+ var func = isArray(collection) ? arrayReduceRight : baseReduce,
+ initAccum = arguments.length < 3;
+
+ return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
+ }
+
+ /**
+ * The opposite of \`_.filter\`; this method returns the elements of \`collection\`
+ * that \`predicate\` does **not** return truthy for.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {Array} Returns the new filtered array.
+ * @see _.filter
+ * @example
+ *
+ * var users = [
+ * { 'user': 'barney', 'age': 36, 'active': false },
+ * { 'user': 'fred', 'age': 40, 'active': true }
+ * ];
+ *
+ * _.reject(users, function(o) { return !o.active; });
+ * // => objects for ['fred']
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.reject(users, { 'age': 40, 'active': true });
+ * // => objects for ['barney']
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.reject(users, ['active', false]);
+ * // => objects for ['fred']
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.reject(users, 'active');
+ * // => objects for ['barney']
+ */
+ function reject(collection, predicate) {
+ var func = isArray(collection) ? arrayFilter : baseFilter;
+ return func(collection, negate(getIteratee(predicate, 3)));
+ }
+
+ /**
+ * Gets a random element from \`collection\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to sample.
+ * @returns {*} Returns the random element.
+ * @example
+ *
+ * _.sample([1, 2, 3, 4]);
+ * // => 2
+ */
+ function sample(collection) {
+ var func = isArray(collection) ? arraySample : baseSample;
+ return func(collection);
+ }
+
+ /**
+ * Gets \`n\` random elements at unique keys from \`collection\` up to the
+ * size of \`collection\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to sample.
+ * @param {number} [n=1] The number of elements to sample.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Array} Returns the random elements.
+ * @example
+ *
+ * _.sampleSize([1, 2, 3], 2);
+ * // => [3, 1]
+ *
+ * _.sampleSize([1, 2, 3], 4);
+ * // => [2, 3, 1]
+ */
+ function sampleSize(collection, n, guard) {
+ if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
+ n = 1;
+ } else {
+ n = toInteger(n);
+ }
+ var func = isArray(collection) ? arraySampleSize : baseSampleSize;
+ return func(collection, n);
+ }
+
+ /**
+ * Creates an array of shuffled values, using a version of the
+ * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ * @example
+ *
+ * _.shuffle([1, 2, 3, 4]);
+ * // => [4, 1, 3, 2]
+ */
+ function shuffle(collection) {
+ var func = isArray(collection) ? arrayShuffle : baseShuffle;
+ return func(collection);
+ }
+
+ /**
+ * Gets the size of \`collection\` by returning its length for array-like
+ * values or the number of own enumerable string keyed properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @returns {number} Returns the collection size.
+ * @example
+ *
+ * _.size([1, 2, 3]);
+ * // => 3
+ *
+ * _.size({ 'a': 1, 'b': 2 });
+ * // => 2
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+ function size(collection) {
+ if (collection == null) {
+ return 0;
+ }
+ if (isArrayLike(collection)) {
+ return isString(collection) ? stringSize(collection) : collection.length;
+ }
+ var tag = getTag(collection);
+ if (tag == mapTag || tag == setTag) {
+ return collection.size;
+ }
+ return baseKeys(collection).length;
+ }
+
+ /**
+ * Checks if \`predicate\` returns truthy for **any** element of \`collection\`.
+ * Iteration is stopped once \`predicate\` returns truthy. The predicate is
+ * invoked with three arguments: (value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {boolean} Returns \`true\` if any element passes the predicate check,
+ * else \`false\`.
+ * @example
+ *
+ * _.some([null, 0, 'yes', false], Boolean);
+ * // => true
+ *
+ * var users = [
+ * { 'user': 'barney', 'active': true },
+ * { 'user': 'fred', 'active': false }
+ * ];
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.some(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.some(users, ['active', false]);
+ * // => true
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.some(users, 'active');
+ * // => true
+ */
+ function some(collection, predicate, guard) {
+ var func = isArray(collection) ? arraySome : baseSome;
+ if (guard && isIterateeCall(collection, predicate, guard)) {
+ predicate = undefined;
+ }
+ return func(collection, getIteratee(predicate, 3));
+ }
+
+ /**
+ * Creates an array of elements, sorted in ascending order by the results of
+ * running each element in a collection thru each iteratee. This method
+ * performs a stable sort, that is, it preserves the original sort order of
+ * equal elements. The iteratees are invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {...(Function|Function[])} [iteratees=[_.identity]]
+ * The iteratees to sort by.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ * { 'user': 'fred', 'age': 48 },
+ * { 'user': 'barney', 'age': 36 },
+ * { 'user': 'fred', 'age': 40 },
+ * { 'user': 'barney', 'age': 34 }
+ * ];
+ *
+ * _.sortBy(users, [function(o) { return o.user; }]);
+ * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
+ *
+ * _.sortBy(users, ['user', 'age']);
+ * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
+ */
+ var sortBy = baseRest(function(collection, iteratees) {
+ if (collection == null) {
+ return [];
+ }
+ var length = iteratees.length;
+ if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
+ iteratees = [];
+ } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
+ iteratees = [iteratees[0]];
+ }
+ return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
+ });
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Gets the timestamp of the number of milliseconds that have elapsed since
+ * the Unix epoch (1 January 1970 00:00:00 UTC).
+ *
+ * @static
+ * @memberOf _
+ * @since 2.4.0
+ * @category Date
+ * @returns {number} Returns the timestamp.
+ * @example
+ *
+ * _.defer(function(stamp) {
+ * console.log(_.now() - stamp);
+ * }, _.now());
+ * // => Logs the number of milliseconds it took for the deferred invocation.
+ */
+ var now = ctxNow || function() {
+ return root.Date.now();
+ };
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * The opposite of \`_.before\`; this method creates a function that invokes
+ * \`func\` once it's called \`n\` or more times.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {number} n The number of calls before \`func\` is invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var saves = ['profile', 'settings'];
+ *
+ * var done = _.after(saves.length, function() {
+ * console.log('done saving!');
+ * });
+ *
+ * _.forEach(saves, function(type) {
+ * asyncSave({ 'type': type, 'complete': done });
+ * });
+ * // => Logs 'done saving!' after the two async saves have completed.
+ */
+ function after(n, func) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ n = toInteger(n);
+ return function() {
+ if (--n < 1) {
+ return func.apply(this, arguments);
+ }
+ };
+ }
+
+ /**
+ * Creates a function that invokes \`func\`, with up to \`n\` arguments,
+ * ignoring any additional arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to cap arguments for.
+ * @param {number} [n=func.length] The arity cap.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Function} Returns the new capped function.
+ * @example
+ *
+ * _.map(['6', '8', '10'], _.ary(parseInt, 1));
+ * // => [6, 8, 10]
+ */
+ function ary(func, n, guard) {
+ n = guard ? undefined : n;
+ n = (func && n == null) ? func.length : n;
+ return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
+ }
+
+ /**
+ * Creates a function that invokes \`func\`, with the \`this\` binding and arguments
+ * of the created function, while it's called less than \`n\` times. Subsequent
+ * calls to the created function return the result of the last \`func\` invocation.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {number} n The number of calls at which \`func\` is no longer invoked.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * jQuery(element).on('click', _.before(5, addContactToList));
+ * // => Allows adding up to 4 contacts to the list.
+ */
+ function before(n, func) {
+ var result;
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ n = toInteger(n);
+ return function() {
+ if (--n > 0) {
+ result = func.apply(this, arguments);
+ }
+ if (n <= 1) {
+ func = undefined;
+ }
+ return result;
+ };
+ }
+
+ /**
+ * Creates a function that invokes \`func\` with the \`this\` binding of \`thisArg\`
+ * and \`partials\` prepended to the arguments it receives.
+ *
+ * The \`_.bind.placeholder\` value, which defaults to \`_\` in monolithic builds,
+ * may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** Unlike native \`Function#bind\`, this method doesn't set the \\"length\\"
+ * property of bound functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The \`this\` binding of \`func\`.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * function greet(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * }
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * var bound = _.bind(greet, object, 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * // Bound with placeholders.
+ * var bound = _.bind(greet, object, _, '!');
+ * bound('hi');
+ * // => 'hi fred!'
+ */
+ var bind = baseRest(function(func, thisArg, partials) {
+ var bitmask = WRAP_BIND_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, getHolder(bind));
+ bitmask |= WRAP_PARTIAL_FLAG;
+ }
+ return createWrap(func, bitmask, thisArg, partials, holders);
+ });
+
+ /**
+ * Creates a function that invokes the method at \`object[key]\` with \`partials\`
+ * prepended to the arguments it receives.
+ *
+ * This method differs from \`_.bind\` by allowing bound functions to reference
+ * methods that may be redefined or don't yet exist. See
+ * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
+ * for more details.
+ *
+ * The \`_.bindKey.placeholder\` value, which defaults to \`_\` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.10.0
+ * @category Function
+ * @param {Object} object The object to invoke the method on.
+ * @param {string} key The key of the method.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var object = {
+ * 'user': 'fred',
+ * 'greet': function(greeting, punctuation) {
+ * return greeting + ' ' + this.user + punctuation;
+ * }
+ * };
+ *
+ * var bound = _.bindKey(object, 'greet', 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * object.greet = function(greeting, punctuation) {
+ * return greeting + 'ya ' + this.user + punctuation;
+ * };
+ *
+ * bound('!');
+ * // => 'hiya fred!'
+ *
+ * // Bound with placeholders.
+ * var bound = _.bindKey(object, 'greet', _, '!');
+ * bound('hi');
+ * // => 'hiya fred!'
+ */
+ var bindKey = baseRest(function(object, key, partials) {
+ var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
+ if (partials.length) {
+ var holders = replaceHolders(partials, getHolder(bindKey));
+ bitmask |= WRAP_PARTIAL_FLAG;
+ }
+ return createWrap(key, bitmask, object, partials, holders);
+ });
+
+ /**
+ * Creates a function that accepts arguments of \`func\` and either invokes
+ * \`func\` returning its result, if at least \`arity\` number of arguments have
+ * been provided, or returns a function that accepts the remaining \`func\`
+ * arguments, and so on. The arity of \`func\` may be specified if \`func.length\`
+ * is not sufficient.
+ *
+ * The \`_.curry.placeholder\` value, which defaults to \`_\` in monolithic builds,
+ * may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method doesn't set the \\"length\\" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of \`func\`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curry(abc);
+ *
+ * curried(1)(2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2)(3);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // Curried with placeholders.
+ * curried(1)(_, 3)(2);
+ * // => [1, 2, 3]
+ */
+ function curry(func, arity, guard) {
+ arity = guard ? undefined : arity;
+ var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+ result.placeholder = curry.placeholder;
+ return result;
+ }
+
+ /**
+ * This method is like \`_.curry\` except that arguments are applied to \`func\`
+ * in the manner of \`_.partialRight\` instead of \`_.partial\`.
+ *
+ * The \`_.curryRight.placeholder\` value, which defaults to \`_\` in monolithic
+ * builds, may be used as a placeholder for provided arguments.
+ *
+ * **Note:** This method doesn't set the \\"length\\" property of curried functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to curry.
+ * @param {number} [arity=func.length] The arity of \`func\`.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Function} Returns the new curried function.
+ * @example
+ *
+ * var abc = function(a, b, c) {
+ * return [a, b, c];
+ * };
+ *
+ * var curried = _.curryRight(abc);
+ *
+ * curried(3)(2)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(2, 3)(1);
+ * // => [1, 2, 3]
+ *
+ * curried(1, 2, 3);
+ * // => [1, 2, 3]
+ *
+ * // Curried with placeholders.
+ * curried(3)(1, _)(2);
+ * // => [1, 2, 3]
+ */
+ function curryRight(func, arity, guard) {
+ arity = guard ? undefined : arity;
+ var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+ result.placeholder = curryRight.placeholder;
+ return result;
+ }
+
+ /**
+ * Creates a debounced function that delays invoking \`func\` until after \`wait\`
+ * milliseconds have elapsed since the last time the debounced function was
+ * invoked. The debounced function comes with a \`cancel\` method to cancel
+ * delayed \`func\` invocations and a \`flush\` method to immediately invoke them.
+ * Provide \`options\` to indicate whether \`func\` should be invoked on the
+ * leading and/or trailing edge of the \`wait\` timeout. The \`func\` is invoked
+ * with the last arguments provided to the debounced function. Subsequent
+ * calls to the debounced function return the result of the last \`func\`
+ * invocation.
+ *
+ * **Note:** If \`leading\` and \`trailing\` options are \`true\`, \`func\` is
+ * invoked on the trailing edge of the timeout only if the debounced function
+ * is invoked more than once during the \`wait\` timeout.
+ *
+ * If \`wait\` is \`0\` and \`leading\` is \`false\`, \`func\` invocation is deferred
+ * until to the next tick, similar to \`setTimeout\` with a timeout of \`0\`.
+ *
+ * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+ * for details over the differences between \`_.debounce\` and \`_.throttle\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to debounce.
+ * @param {number} [wait=0] The number of milliseconds to delay.
+ * @param {Object} [options={}] The options object.
+ * @param {boolean} [options.leading=false]
+ * Specify invoking on the leading edge of the timeout.
+ * @param {number} [options.maxWait]
+ * The maximum time \`func\` is allowed to be delayed before it's invoked.
+ * @param {boolean} [options.trailing=true]
+ * Specify invoking on the trailing edge of the timeout.
+ * @returns {Function} Returns the new debounced function.
+ * @example
+ *
+ * // Avoid costly calculations while the window size is in flux.
+ * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
+ *
+ * // Invoke \`sendMail\` when clicked, debouncing subsequent calls.
+ * jQuery(element).on('click', _.debounce(sendMail, 300, {
+ * 'leading': true,
+ * 'trailing': false
+ * }));
+ *
+ * // Ensure \`batchLog\` is invoked once after 1 second of debounced calls.
+ * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
+ * var source = new EventSource('/stream');
+ * jQuery(source).on('message', debounced);
+ *
+ * // Cancel the trailing debounced invocation.
+ * jQuery(window).on('popstate', debounced.cancel);
+ */
+ function debounce(func, wait, options) {
+ var lastArgs,
+ lastThis,
+ maxWait,
+ result,
+ timerId,
+ lastCallTime,
+ lastInvokeTime = 0,
+ leading = false,
+ maxing = false,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ wait = toNumber(wait) || 0;
+ if (isObject(options)) {
+ leading = !!options.leading;
+ maxing = 'maxWait' in options;
+ maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+
+ function invokeFunc(time) {
+ var args = lastArgs,
+ thisArg = lastThis;
+
+ lastArgs = lastThis = undefined;
+ lastInvokeTime = time;
+ result = func.apply(thisArg, args);
+ return result;
+ }
+
+ function leadingEdge(time) {
+ // Reset any \`maxWait\` timer.
+ lastInvokeTime = time;
+ // Start the timer for the trailing edge.
+ timerId = setTimeout(timerExpired, wait);
+ // Invoke the leading edge.
+ return leading ? invokeFunc(time) : result;
+ }
+
+ function remainingWait(time) {
+ var timeSinceLastCall = time - lastCallTime,
+ timeSinceLastInvoke = time - lastInvokeTime,
+ timeWaiting = wait - timeSinceLastCall;
+
+ return maxing
+ ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
+ : timeWaiting;
+ }
+
+ function shouldInvoke(time) {
+ var timeSinceLastCall = time - lastCallTime,
+ timeSinceLastInvoke = time - lastInvokeTime;
+
+ // Either this is the first call, activity has stopped and we're at the
+ // trailing edge, the system time has gone backwards and we're treating
+ // it as the trailing edge, or we've hit the \`maxWait\` limit.
+ return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
+ (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
+ }
+
+ function timerExpired() {
+ var time = now();
+ if (shouldInvoke(time)) {
+ return trailingEdge(time);
+ }
+ // Restart the timer.
+ timerId = setTimeout(timerExpired, remainingWait(time));
+ }
+
+ function trailingEdge(time) {
+ timerId = undefined;
+
+ // Only invoke if we have \`lastArgs\` which means \`func\` has been
+ // debounced at least once.
+ if (trailing && lastArgs) {
+ return invokeFunc(time);
+ }
+ lastArgs = lastThis = undefined;
+ return result;
+ }
+
+ function cancel() {
+ if (timerId !== undefined) {
+ clearTimeout(timerId);
+ }
+ lastInvokeTime = 0;
+ lastArgs = lastCallTime = lastThis = timerId = undefined;
+ }
+
+ function flush() {
+ return timerId === undefined ? result : trailingEdge(now());
+ }
+
+ function debounced() {
+ var time = now(),
+ isInvoking = shouldInvoke(time);
+
+ lastArgs = arguments;
+ lastThis = this;
+ lastCallTime = time;
+
+ if (isInvoking) {
+ if (timerId === undefined) {
+ return leadingEdge(lastCallTime);
+ }
+ if (maxing) {
+ // Handle invocations in a tight loop.
+ clearTimeout(timerId);
+ timerId = setTimeout(timerExpired, wait);
+ return invokeFunc(lastCallTime);
+ }
+ }
+ if (timerId === undefined) {
+ timerId = setTimeout(timerExpired, wait);
+ }
+ return result;
+ }
+ debounced.cancel = cancel;
+ debounced.flush = flush;
+ return debounced;
+ }
+
+ /**
+ * Defers invoking the \`func\` until the current call stack has cleared. Any
+ * additional arguments are provided to \`func\` when it's invoked.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to defer.
+ * @param {...*} [args] The arguments to invoke \`func\` with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.defer(function(text) {
+ * console.log(text);
+ * }, 'deferred');
+ * // => Logs 'deferred' after one millisecond.
+ */
+ var defer = baseRest(function(func, args) {
+ return baseDelay(func, 1, args);
+ });
+
+ /**
+ * Invokes \`func\` after \`wait\` milliseconds. Any additional arguments are
+ * provided to \`func\` when it's invoked.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to delay.
+ * @param {number} wait The number of milliseconds to delay invocation.
+ * @param {...*} [args] The arguments to invoke \`func\` with.
+ * @returns {number} Returns the timer id.
+ * @example
+ *
+ * _.delay(function(text) {
+ * console.log(text);
+ * }, 1000, 'later');
+ * // => Logs 'later' after one second.
+ */
+ var delay = baseRest(function(func, wait, args) {
+ return baseDelay(func, toNumber(wait) || 0, args);
+ });
+
+ /**
+ * Creates a function that invokes \`func\` with arguments reversed.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to flip arguments for.
+ * @returns {Function} Returns the new flipped function.
+ * @example
+ *
+ * var flipped = _.flip(function() {
+ * return _.toArray(arguments);
+ * });
+ *
+ * flipped('a', 'b', 'c', 'd');
+ * // => ['d', 'c', 'b', 'a']
+ */
+ function flip(func) {
+ return createWrap(func, WRAP_FLIP_FLAG);
+ }
+
+ /**
+ * Creates a function that memoizes the result of \`func\`. If \`resolver\` is
+ * provided, it determines the cache key for storing the result based on the
+ * arguments provided to the memoized function. By default, the first argument
+ * provided to the memoized function is used as the map cache key. The \`func\`
+ * is invoked with the \`this\` binding of the memoized function.
+ *
+ * **Note:** The cache is exposed as the \`cache\` property on the memoized
+ * function. Its creation may be customized by replacing the \`_.memoize.Cache\`
+ * constructor with one whose instances implement the
+ * [\`Map\`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
+ * method interface of \`clear\`, \`delete\`, \`get\`, \`has\`, and \`set\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to have its output memoized.
+ * @param {Function} [resolver] The function to resolve the cache key.
+ * @returns {Function} Returns the new memoized function.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2 };
+ * var other = { 'c': 3, 'd': 4 };
+ *
+ * var values = _.memoize(_.values);
+ * values(object);
+ * // => [1, 2]
+ *
+ * values(other);
+ * // => [3, 4]
+ *
+ * object.a = 2;
+ * values(object);
+ * // => [1, 2]
+ *
+ * // Modify the result cache.
+ * values.cache.set(object, ['a', 'b']);
+ * values(object);
+ * // => ['a', 'b']
+ *
+ * // Replace \`_.memoize.Cache\`.
+ * _.memoize.Cache = WeakMap;
+ */
+ function memoize(func, resolver) {
+ if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ var memoized = function() {
+ var args = arguments,
+ key = resolver ? resolver.apply(this, args) : args[0],
+ cache = memoized.cache;
+
+ if (cache.has(key)) {
+ return cache.get(key);
+ }
+ var result = func.apply(this, args);
+ memoized.cache = cache.set(key, result) || cache;
+ return result;
+ };
+ memoized.cache = new (memoize.Cache || MapCache);
+ return memoized;
+ }
+
+ // Expose \`MapCache\`.
+ memoize.Cache = MapCache;
+
+ /**
+ * Creates a function that negates the result of the predicate \`func\`. The
+ * \`func\` predicate is invoked with the \`this\` binding and arguments of the
+ * created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} predicate The predicate to negate.
+ * @returns {Function} Returns the new negated function.
+ * @example
+ *
+ * function isEven(n) {
+ * return n % 2 == 0;
+ * }
+ *
+ * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
+ * // => [1, 3, 5]
+ */
+ function negate(predicate) {
+ if (typeof predicate != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ return function() {
+ var args = arguments;
+ switch (args.length) {
+ case 0: return !predicate.call(this);
+ case 1: return !predicate.call(this, args[0]);
+ case 2: return !predicate.call(this, args[0], args[1]);
+ case 3: return !predicate.call(this, args[0], args[1], args[2]);
+ }
+ return !predicate.apply(this, args);
+ };
+ }
+
+ /**
+ * Creates a function that is restricted to invoking \`func\` once. Repeat calls
+ * to the function return the value of the first invocation. The \`func\` is
+ * invoked with the \`this\` binding and arguments of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var initialize = _.once(createApplication);
+ * initialize();
+ * initialize();
+ * // => \`createApplication\` is invoked once
+ */
+ function once(func) {
+ return before(2, func);
+ }
+
+ /**
+ * Creates a function that invokes \`func\` with its arguments transformed.
+ *
+ * @static
+ * @since 4.0.0
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to wrap.
+ * @param {...(Function|Function[])} [transforms=[_.identity]]
+ * The argument transforms.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function doubled(n) {
+ * return n * 2;
+ * }
+ *
+ * function square(n) {
+ * return n * n;
+ * }
+ *
+ * var func = _.overArgs(function(x, y) {
+ * return [x, y];
+ * }, [square, doubled]);
+ *
+ * func(9, 3);
+ * // => [81, 6]
+ *
+ * func(10, 5);
+ * // => [100, 10]
+ */
+ var overArgs = castRest(function(func, transforms) {
+ transforms = (transforms.length == 1 && isArray(transforms[0]))
+ ? arrayMap(transforms[0], baseUnary(getIteratee()))
+ : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
+
+ var funcsLength = transforms.length;
+ return baseRest(function(args) {
+ var index = -1,
+ length = nativeMin(args.length, funcsLength);
+
+ while (++index < length) {
+ args[index] = transforms[index].call(this, args[index]);
+ }
+ return apply(func, this, args);
+ });
+ });
+
+ /**
+ * Creates a function that invokes \`func\` with \`partials\` prepended to the
+ * arguments it receives. This method is like \`_.bind\` except it does **not**
+ * alter the \`this\` binding.
+ *
+ * The \`_.partial.placeholder\` value, which defaults to \`_\` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method doesn't set the \\"length\\" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.2.0
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * function greet(greeting, name) {
+ * return greeting + ' ' + name;
+ * }
+ *
+ * var sayHelloTo = _.partial(greet, 'hello');
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ *
+ * // Partially applied with placeholders.
+ * var greetFred = _.partial(greet, _, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ */
+ var partial = baseRest(function(func, partials) {
+ var holders = replaceHolders(partials, getHolder(partial));
+ return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
+ });
+
+ /**
+ * This method is like \`_.partial\` except that partially applied arguments
+ * are appended to the arguments it receives.
+ *
+ * The \`_.partialRight.placeholder\` value, which defaults to \`_\` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method doesn't set the \\"length\\" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.0.0
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * function greet(greeting, name) {
+ * return greeting + ' ' + name;
+ * }
+ *
+ * var greetFred = _.partialRight(greet, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ *
+ * // Partially applied with placeholders.
+ * var sayHelloTo = _.partialRight(greet, 'hello', _);
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ */
+ var partialRight = baseRest(function(func, partials) {
+ var holders = replaceHolders(partials, getHolder(partialRight));
+ return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
+ });
+
+ /**
+ * Creates a function that invokes \`func\` with arguments arranged according
+ * to the specified \`indexes\` where the argument value at the first index is
+ * provided as the first argument, the argument value at the second index is
+ * provided as the second argument, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} func The function to rearrange arguments for.
+ * @param {...(number|number[])} indexes The arranged argument indexes.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var rearged = _.rearg(function(a, b, c) {
+ * return [a, b, c];
+ * }, [2, 0, 1]);
+ *
+ * rearged('b', 'c', 'a')
+ * // => ['a', 'b', 'c']
+ */
+ var rearg = flatRest(function(func, indexes) {
+ return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
+ });
+
+ /**
+ * Creates a function that invokes \`func\` with the \`this\` binding of the
+ * created function and arguments from \`start\` and beyond provided as
+ * an array.
+ *
+ * **Note:** This method is based on the
+ * [rest parameter](https://mdn.io/rest_parameters).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.rest(function(what, names) {
+ * return what + ' ' + _.initial(names).join(', ') +
+ * (_.size(names) > 1 ? ', & ' : '') + _.last(names);
+ * });
+ *
+ * say('hello', 'fred', 'barney', 'pebbles');
+ * // => 'hello fred, barney, & pebbles'
+ */
+ function rest(func, start) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ start = start === undefined ? start : toInteger(start);
+ return baseRest(func, start);
+ }
+
+ /**
+ * Creates a function that invokes \`func\` with the \`this\` binding of the
+ * create function and an array of arguments much like
+ * [\`Function#apply\`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
+ *
+ * **Note:** This method is based on the
+ * [spread operator](https://mdn.io/spread_operator).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.2.0
+ * @category Function
+ * @param {Function} func The function to spread arguments over.
+ * @param {number} [start=0] The start position of the spread.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var say = _.spread(function(who, what) {
+ * return who + ' says ' + what;
+ * });
+ *
+ * say(['fred', 'hello']);
+ * // => 'fred says hello'
+ *
+ * var numbers = Promise.all([
+ * Promise.resolve(40),
+ * Promise.resolve(36)
+ * ]);
+ *
+ * numbers.then(_.spread(function(x, y) {
+ * return x + y;
+ * }));
+ * // => a Promise of 76
+ */
+ function spread(func, start) {
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ start = start == null ? 0 : nativeMax(toInteger(start), 0);
+ return baseRest(function(args) {
+ var array = args[start],
+ otherArgs = castSlice(args, 0, start);
+
+ if (array) {
+ arrayPush(otherArgs, array);
+ }
+ return apply(func, this, otherArgs);
+ });
+ }
+
+ /**
+ * Creates a throttled function that only invokes \`func\` at most once per
+ * every \`wait\` milliseconds. The throttled function comes with a \`cancel\`
+ * method to cancel delayed \`func\` invocations and a \`flush\` method to
+ * immediately invoke them. Provide \`options\` to indicate whether \`func\`
+ * should be invoked on the leading and/or trailing edge of the \`wait\`
+ * timeout. The \`func\` is invoked with the last arguments provided to the
+ * throttled function. Subsequent calls to the throttled function return the
+ * result of the last \`func\` invocation.
+ *
+ * **Note:** If \`leading\` and \`trailing\` options are \`true\`, \`func\` is
+ * invoked on the trailing edge of the timeout only if the throttled function
+ * is invoked more than once during the \`wait\` timeout.
+ *
+ * If \`wait\` is \`0\` and \`leading\` is \`false\`, \`func\` invocation is deferred
+ * until to the next tick, similar to \`setTimeout\` with a timeout of \`0\`.
+ *
+ * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+ * for details over the differences between \`_.throttle\` and \`_.debounce\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {Function} func The function to throttle.
+ * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
+ * @param {Object} [options={}] The options object.
+ * @param {boolean} [options.leading=true]
+ * Specify invoking on the leading edge of the timeout.
+ * @param {boolean} [options.trailing=true]
+ * Specify invoking on the trailing edge of the timeout.
+ * @returns {Function} Returns the new throttled function.
+ * @example
+ *
+ * // Avoid excessively updating the position while scrolling.
+ * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
+ *
+ * // Invoke \`renewToken\` when the click event is fired, but not more than once every 5 minutes.
+ * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
+ * jQuery(element).on('click', throttled);
+ *
+ * // Cancel the trailing throttled invocation.
+ * jQuery(window).on('popstate', throttled.cancel);
+ */
+ function throttle(func, wait, options) {
+ var leading = true,
+ trailing = true;
+
+ if (typeof func != 'function') {
+ throw new TypeError(FUNC_ERROR_TEXT);
+ }
+ if (isObject(options)) {
+ leading = 'leading' in options ? !!options.leading : leading;
+ trailing = 'trailing' in options ? !!options.trailing : trailing;
+ }
+ return debounce(func, wait, {
+ 'leading': leading,
+ 'maxWait': wait,
+ 'trailing': trailing
+ });
+ }
+
+ /**
+ * Creates a function that accepts up to one argument, ignoring any
+ * additional arguments.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Function
+ * @param {Function} func The function to cap arguments for.
+ * @returns {Function} Returns the new capped function.
+ * @example
+ *
+ * _.map(['6', '8', '10'], _.unary(parseInt));
+ * // => [6, 8, 10]
+ */
+ function unary(func) {
+ return ary(func, 1);
+ }
+
+ /**
+ * Creates a function that provides \`value\` to \`wrapper\` as its first
+ * argument. Any additional arguments provided to the function are appended
+ * to those provided to the \`wrapper\`. The wrapper is invoked with the \`this\`
+ * binding of the created function.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Function
+ * @param {*} value The value to wrap.
+ * @param {Function} [wrapper=identity] The wrapper function.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var p = _.wrap(_.escape, function(func, text) {
+ * return '' + func(text) + '
';
+ * });
+ *
+ * p('fred, barney, & pebbles');
+ * // => 'fred, barney, & pebbles
'
+ */
+ function wrap(value, wrapper) {
+ return partial(castFunction(wrapper), value);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Casts \`value\` as an array if it's not one.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.4.0
+ * @category Lang
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the cast array.
+ * @example
+ *
+ * _.castArray(1);
+ * // => [1]
+ *
+ * _.castArray({ 'a': 1 });
+ * // => [{ 'a': 1 }]
+ *
+ * _.castArray('abc');
+ * // => ['abc']
+ *
+ * _.castArray(null);
+ * // => [null]
+ *
+ * _.castArray(undefined);
+ * // => [undefined]
+ *
+ * _.castArray();
+ * // => []
+ *
+ * var array = [1, 2, 3];
+ * console.log(_.castArray(array) === array);
+ * // => true
+ */
+ function castArray() {
+ if (!arguments.length) {
+ return [];
+ }
+ var value = arguments[0];
+ return isArray(value) ? value : [value];
+ }
+
+ /**
+ * Creates a shallow clone of \`value\`.
+ *
+ * **Note:** This method is loosely based on the
+ * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
+ * and supports cloning arrays, array buffers, booleans, date objects, maps,
+ * numbers, \`Object\` objects, regexes, sets, strings, symbols, and typed
+ * arrays. The own enumerable properties of \`arguments\` objects are cloned
+ * as plain objects. An empty object is returned for uncloneable values such
+ * as error objects, functions, DOM nodes, and WeakMaps.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to clone.
+ * @returns {*} Returns the cloned value.
+ * @see _.cloneDeep
+ * @example
+ *
+ * var objects = [{ 'a': 1 }, { 'b': 2 }];
+ *
+ * var shallow = _.clone(objects);
+ * console.log(shallow[0] === objects[0]);
+ * // => true
+ */
+ function clone(value) {
+ return baseClone(value, CLONE_SYMBOLS_FLAG);
+ }
+
+ /**
+ * This method is like \`_.clone\` except that it accepts \`customizer\` which
+ * is invoked to produce the cloned value. If \`customizer\` returns \`undefined\`,
+ * cloning is handled by the method instead. The \`customizer\` is invoked with
+ * up to four arguments; (value [, index|key, object, stack]).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to clone.
+ * @param {Function} [customizer] The function to customize cloning.
+ * @returns {*} Returns the cloned value.
+ * @see _.cloneDeepWith
+ * @example
+ *
+ * function customizer(value) {
+ * if (_.isElement(value)) {
+ * return value.cloneNode(false);
+ * }
+ * }
+ *
+ * var el = _.cloneWith(document.body, customizer);
+ *
+ * console.log(el === document.body);
+ * // => false
+ * console.log(el.nodeName);
+ * // => 'BODY'
+ * console.log(el.childNodes.length);
+ * // => 0
+ */
+ function cloneWith(value, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
+ }
+
+ /**
+ * This method is like \`_.clone\` except that it recursively clones \`value\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.0.0
+ * @category Lang
+ * @param {*} value The value to recursively clone.
+ * @returns {*} Returns the deep cloned value.
+ * @see _.clone
+ * @example
+ *
+ * var objects = [{ 'a': 1 }, { 'b': 2 }];
+ *
+ * var deep = _.cloneDeep(objects);
+ * console.log(deep[0] === objects[0]);
+ * // => false
+ */
+ function cloneDeep(value) {
+ return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
+ }
+
+ /**
+ * This method is like \`_.cloneWith\` except that it recursively clones \`value\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to recursively clone.
+ * @param {Function} [customizer] The function to customize cloning.
+ * @returns {*} Returns the deep cloned value.
+ * @see _.cloneWith
+ * @example
+ *
+ * function customizer(value) {
+ * if (_.isElement(value)) {
+ * return value.cloneNode(true);
+ * }
+ * }
+ *
+ * var el = _.cloneDeepWith(document.body, customizer);
+ *
+ * console.log(el === document.body);
+ * // => false
+ * console.log(el.nodeName);
+ * // => 'BODY'
+ * console.log(el.childNodes.length);
+ * // => 20
+ */
+ function cloneDeepWith(value, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
+ }
+
+ /**
+ * Checks if \`object\` conforms to \`source\` by invoking the predicate
+ * properties of \`source\` with the corresponding property values of \`object\`.
+ *
+ * **Note:** This method is equivalent to \`_.conforms\` when \`source\` is
+ * partially applied.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.14.0
+ * @category Lang
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns \`true\` if \`object\` conforms, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2 };
+ *
+ * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
+ * // => true
+ *
+ * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
+ * // => false
+ */
+ function conformsTo(object, source) {
+ return source == null || baseConformsTo(object, source, keys(source));
+ }
+
+ /**
+ * Performs a
+ * [\`SameValueZero\`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
+ * comparison between two values to determine if they are equivalent.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if the values are equivalent, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': 1 };
+ * var other = { 'a': 1 };
+ *
+ * _.eq(object, object);
+ * // => true
+ *
+ * _.eq(object, other);
+ * // => false
+ *
+ * _.eq('a', 'a');
+ * // => true
+ *
+ * _.eq('a', Object('a'));
+ * // => false
+ *
+ * _.eq(NaN, NaN);
+ * // => true
+ */
+ function eq(value, other) {
+ return value === other || (value !== value && other !== other);
+ }
+
+ /**
+ * Checks if \`value\` is greater than \`other\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.9.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is greater than \`other\`,
+ * else \`false\`.
+ * @see _.lt
+ * @example
+ *
+ * _.gt(3, 1);
+ * // => true
+ *
+ * _.gt(3, 3);
+ * // => false
+ *
+ * _.gt(1, 3);
+ * // => false
+ */
+ var gt = createRelationalOperation(baseGt);
+
+ /**
+ * Checks if \`value\` is greater than or equal to \`other\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.9.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is greater than or equal to
+ * \`other\`, else \`false\`.
+ * @see _.lte
+ * @example
+ *
+ * _.gte(3, 1);
+ * // => true
+ *
+ * _.gte(3, 3);
+ * // => true
+ *
+ * _.gte(1, 3);
+ * // => false
+ */
+ var gte = createRelationalOperation(function(value, other) {
+ return value >= other;
+ });
+
+ /**
+ * Checks if \`value\` is likely an \`arguments\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an \`arguments\` object,
+ * else \`false\`.
+ * @example
+ *
+ * _.isArguments(function() { return arguments; }());
+ * // => true
+ *
+ * _.isArguments([1, 2, 3]);
+ * // => false
+ */
+ var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
+ return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
+ !propertyIsEnumerable.call(value, 'callee');
+ };
+
+ /**
+ * Checks if \`value\` is classified as an \`Array\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an array, else \`false\`.
+ * @example
+ *
+ * _.isArray([1, 2, 3]);
+ * // => true
+ *
+ * _.isArray(document.body.children);
+ * // => false
+ *
+ * _.isArray('abc');
+ * // => false
+ *
+ * _.isArray(_.noop);
+ * // => false
+ */
+ var isArray = Array.isArray;
+
+ /**
+ * Checks if \`value\` is classified as an \`ArrayBuffer\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an array buffer, else \`false\`.
+ * @example
+ *
+ * _.isArrayBuffer(new ArrayBuffer(2));
+ * // => true
+ *
+ * _.isArrayBuffer(new Array(2));
+ * // => false
+ */
+ var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
+
+ /**
+ * Checks if \`value\` is array-like. A value is considered array-like if it's
+ * not a function and has a \`value.length\` that's an integer greater than or
+ * equal to \`0\` and less than or equal to \`Number.MAX_SAFE_INTEGER\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is array-like, else \`false\`.
+ * @example
+ *
+ * _.isArrayLike([1, 2, 3]);
+ * // => true
+ *
+ * _.isArrayLike(document.body.children);
+ * // => true
+ *
+ * _.isArrayLike('abc');
+ * // => true
+ *
+ * _.isArrayLike(_.noop);
+ * // => false
+ */
+ function isArrayLike(value) {
+ return value != null && isLength(value.length) && !isFunction(value);
+ }
+
+ /**
+ * This method is like \`_.isArrayLike\` except that it also checks if \`value\`
+ * is an object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an array-like object,
+ * else \`false\`.
+ * @example
+ *
+ * _.isArrayLikeObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isArrayLikeObject(document.body.children);
+ * // => true
+ *
+ * _.isArrayLikeObject('abc');
+ * // => false
+ *
+ * _.isArrayLikeObject(_.noop);
+ * // => false
+ */
+ function isArrayLikeObject(value) {
+ return isObjectLike(value) && isArrayLike(value);
+ }
+
+ /**
+ * Checks if \`value\` is classified as a boolean primitive or object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a boolean, else \`false\`.
+ * @example
+ *
+ * _.isBoolean(false);
+ * // => true
+ *
+ * _.isBoolean(null);
+ * // => false
+ */
+ function isBoolean(value) {
+ return value === true || value === false ||
+ (isObjectLike(value) && baseGetTag(value) == boolTag);
+ }
+
+ /**
+ * Checks if \`value\` is a buffer.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a buffer, else \`false\`.
+ * @example
+ *
+ * _.isBuffer(new Buffer(2));
+ * // => true
+ *
+ * _.isBuffer(new Uint8Array(2));
+ * // => false
+ */
+ var isBuffer = nativeIsBuffer || stubFalse;
+
+ /**
+ * Checks if \`value\` is classified as a \`Date\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a date object, else \`false\`.
+ * @example
+ *
+ * _.isDate(new Date);
+ * // => true
+ *
+ * _.isDate('Mon April 23 2012');
+ * // => false
+ */
+ var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
+
+ /**
+ * Checks if \`value\` is likely a DOM element.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a DOM element, else \`false\`.
+ * @example
+ *
+ * _.isElement(document.body);
+ * // => true
+ *
+ * _.isElement('');
+ * // => false
+ */
+ function isElement(value) {
+ return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
+ }
+
+ /**
+ * Checks if \`value\` is an empty object, collection, map, or set.
+ *
+ * Objects are considered empty if they have no own enumerable string keyed
+ * properties.
+ *
+ * Array-like values such as \`arguments\` objects, arrays, buffers, strings, or
+ * jQuery-like collections are considered empty if they have a \`length\` of \`0\`.
+ * Similarly, maps and sets are considered empty if they have a \`size\` of \`0\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is empty, else \`false\`.
+ * @example
+ *
+ * _.isEmpty(null);
+ * // => true
+ *
+ * _.isEmpty(true);
+ * // => true
+ *
+ * _.isEmpty(1);
+ * // => true
+ *
+ * _.isEmpty([1, 2, 3]);
+ * // => false
+ *
+ * _.isEmpty({ 'a': 1 });
+ * // => false
+ */
+ function isEmpty(value) {
+ if (value == null) {
+ return true;
+ }
+ if (isArrayLike(value) &&
+ (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
+ isBuffer(value) || isTypedArray(value) || isArguments(value))) {
+ return !value.length;
+ }
+ var tag = getTag(value);
+ if (tag == mapTag || tag == setTag) {
+ return !value.size;
+ }
+ if (isPrototype(value)) {
+ return !baseKeys(value).length;
+ }
+ for (var key in value) {
+ if (hasOwnProperty.call(value, key)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Performs a deep comparison between two values to determine if they are
+ * equivalent.
+ *
+ * **Note:** This method supports comparing arrays, array buffers, booleans,
+ * date objects, error objects, maps, numbers, \`Object\` objects, regexes,
+ * sets, strings, symbols, and typed arrays. \`Object\` objects are compared
+ * by their own, not inherited, enumerable properties. Functions and DOM
+ * nodes are compared by strict equality, i.e. \`===\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if the values are equivalent, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': 1 };
+ * var other = { 'a': 1 };
+ *
+ * _.isEqual(object, other);
+ * // => true
+ *
+ * object === other;
+ * // => false
+ */
+ function isEqual(value, other) {
+ return baseIsEqual(value, other);
+ }
+
+ /**
+ * This method is like \`_.isEqual\` except that it accepts \`customizer\` which
+ * is invoked to compare values. If \`customizer\` returns \`undefined\`, comparisons
+ * are handled by the method instead. The \`customizer\` is invoked with up to
+ * six arguments: (objValue, othValue [, index|key, object, other, stack]).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @returns {boolean} Returns \`true\` if the values are equivalent, else \`false\`.
+ * @example
+ *
+ * function isGreeting(value) {
+ * return /^h(?:i|ello)$/.test(value);
+ * }
+ *
+ * function customizer(objValue, othValue) {
+ * if (isGreeting(objValue) && isGreeting(othValue)) {
+ * return true;
+ * }
+ * }
+ *
+ * var array = ['hello', 'goodbye'];
+ * var other = ['hi', 'goodbye'];
+ *
+ * _.isEqualWith(array, other, customizer);
+ * // => true
+ */
+ function isEqualWith(value, other, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ var result = customizer ? customizer(value, other) : undefined;
+ return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
+ }
+
+ /**
+ * Checks if \`value\` is an \`Error\`, \`EvalError\`, \`RangeError\`, \`ReferenceError\`,
+ * \`SyntaxError\`, \`TypeError\`, or \`URIError\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an error object, else \`false\`.
+ * @example
+ *
+ * _.isError(new Error);
+ * // => true
+ *
+ * _.isError(Error);
+ * // => false
+ */
+ function isError(value) {
+ if (!isObjectLike(value)) {
+ return false;
+ }
+ var tag = baseGetTag(value);
+ return tag == errorTag || tag == domExcTag ||
+ (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
+ }
+
+ /**
+ * Checks if \`value\` is a finite primitive number.
+ *
+ * **Note:** This method is based on
+ * [\`Number.isFinite\`](https://mdn.io/Number/isFinite).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a finite number, else \`false\`.
+ * @example
+ *
+ * _.isFinite(3);
+ * // => true
+ *
+ * _.isFinite(Number.MIN_VALUE);
+ * // => true
+ *
+ * _.isFinite(Infinity);
+ * // => false
+ *
+ * _.isFinite('3');
+ * // => false
+ */
+ function isFinite(value) {
+ return typeof value == 'number' && nativeIsFinite(value);
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`Function\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a function, else \`false\`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ *
+ * _.isFunction(/abc/);
+ * // => false
+ */
+ function isFunction(value) {
+ if (!isObject(value)) {
+ return false;
+ }
+ // The use of \`Object#toString\` avoids issues with the \`typeof\` operator
+ // in Safari 9 which returns 'object' for typed arrays and other constructors.
+ var tag = baseGetTag(value);
+ return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
+ }
+
+ /**
+ * Checks if \`value\` is an integer.
+ *
+ * **Note:** This method is based on
+ * [\`Number.isInteger\`](https://mdn.io/Number/isInteger).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an integer, else \`false\`.
+ * @example
+ *
+ * _.isInteger(3);
+ * // => true
+ *
+ * _.isInteger(Number.MIN_VALUE);
+ * // => false
+ *
+ * _.isInteger(Infinity);
+ * // => false
+ *
+ * _.isInteger('3');
+ * // => false
+ */
+ function isInteger(value) {
+ return typeof value == 'number' && value == toInteger(value);
+ }
+
+ /**
+ * Checks if \`value\` is a valid array-like length.
+ *
+ * **Note:** This method is loosely based on
+ * [\`ToLength\`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a valid length, else \`false\`.
+ * @example
+ *
+ * _.isLength(3);
+ * // => true
+ *
+ * _.isLength(Number.MIN_VALUE);
+ * // => false
+ *
+ * _.isLength(Infinity);
+ * // => false
+ *
+ * _.isLength('3');
+ * // => false
+ */
+ function isLength(value) {
+ return typeof value == 'number' &&
+ value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+ }
+
+ /**
+ * Checks if \`value\` is the
+ * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
+ * of \`Object\`. (e.g. arrays, functions, objects, regexes, \`new Number(0)\`, and \`new String('')\`)
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is an object, else \`false\`.
+ * @example
+ *
+ * _.isObject({});
+ * // => true
+ *
+ * _.isObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isObject(_.noop);
+ * // => true
+ *
+ * _.isObject(null);
+ * // => false
+ */
+ function isObject(value) {
+ var type = typeof value;
+ return value != null && (type == 'object' || type == 'function');
+ }
+
+ /**
+ * Checks if \`value\` is object-like. A value is object-like if it's not \`null\`
+ * and has a \`typeof\` result of \\"object\\".
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is object-like, else \`false\`.
+ * @example
+ *
+ * _.isObjectLike({});
+ * // => true
+ *
+ * _.isObjectLike([1, 2, 3]);
+ * // => true
+ *
+ * _.isObjectLike(_.noop);
+ * // => false
+ *
+ * _.isObjectLike(null);
+ * // => false
+ */
+ function isObjectLike(value) {
+ return value != null && typeof value == 'object';
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`Map\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a map, else \`false\`.
+ * @example
+ *
+ * _.isMap(new Map);
+ * // => true
+ *
+ * _.isMap(new WeakMap);
+ * // => false
+ */
+ var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
+
+ /**
+ * Performs a partial deep comparison between \`object\` and \`source\` to
+ * determine if \`object\` contains equivalent property values.
+ *
+ * **Note:** This method is equivalent to \`_.matches\` when \`source\` is
+ * partially applied.
+ *
+ * Partial comparisons will match empty array and empty object \`source\`
+ * values against any array or object value, respectively. See \`_.isEqual\`
+ * for a list of supported value comparisons.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Lang
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property values to match.
+ * @returns {boolean} Returns \`true\` if \`object\` is a match, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2 };
+ *
+ * _.isMatch(object, { 'b': 2 });
+ * // => true
+ *
+ * _.isMatch(object, { 'b': 1 });
+ * // => false
+ */
+ function isMatch(object, source) {
+ return object === source || baseIsMatch(object, source, getMatchData(source));
+ }
+
+ /**
+ * This method is like \`_.isMatch\` except that it accepts \`customizer\` which
+ * is invoked to compare values. If \`customizer\` returns \`undefined\`, comparisons
+ * are handled by the method instead. The \`customizer\` is invoked with five
+ * arguments: (objValue, srcValue, index|key, object, source).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property values to match.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @returns {boolean} Returns \`true\` if \`object\` is a match, else \`false\`.
+ * @example
+ *
+ * function isGreeting(value) {
+ * return /^h(?:i|ello)$/.test(value);
+ * }
+ *
+ * function customizer(objValue, srcValue) {
+ * if (isGreeting(objValue) && isGreeting(srcValue)) {
+ * return true;
+ * }
+ * }
+ *
+ * var object = { 'greeting': 'hello' };
+ * var source = { 'greeting': 'hi' };
+ *
+ * _.isMatchWith(object, source, customizer);
+ * // => true
+ */
+ function isMatchWith(object, source, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ return baseIsMatch(object, source, getMatchData(source), customizer);
+ }
+
+ /**
+ * Checks if \`value\` is \`NaN\`.
+ *
+ * **Note:** This method is based on
+ * [\`Number.isNaN\`](https://mdn.io/Number/isNaN) and is not the same as
+ * global [\`isNaN\`](https://mdn.io/isNaN) which returns \`true\` for
+ * \`undefined\` and other non-number values.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is \`NaN\`, else \`false\`.
+ * @example
+ *
+ * _.isNaN(NaN);
+ * // => true
+ *
+ * _.isNaN(new Number(NaN));
+ * // => true
+ *
+ * isNaN(undefined);
+ * // => true
+ *
+ * _.isNaN(undefined);
+ * // => false
+ */
+ function isNaN(value) {
+ // An \`NaN\` primitive is the only value that is not equal to itself.
+ // Perform the \`toStringTag\` check first to avoid errors with some
+ // ActiveX objects in IE.
+ return isNumber(value) && value != +value;
+ }
+
+ /**
+ * Checks if \`value\` is a pristine native function.
+ *
+ * **Note:** This method can't reliably detect native functions in the presence
+ * of the core-js package because core-js circumvents this kind of detection.
+ * Despite multiple requests, the core-js maintainer has made it clear: any
+ * attempt to fix the detection will be obstructed. As a result, we're left
+ * with little choice but to throw an error. Unfortunately, this also affects
+ * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
+ * which rely on core-js.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a native function,
+ * else \`false\`.
+ * @example
+ *
+ * _.isNative(Array.prototype.push);
+ * // => true
+ *
+ * _.isNative(_);
+ * // => false
+ */
+ function isNative(value) {
+ if (isMaskable(value)) {
+ throw new Error(CORE_ERROR_TEXT);
+ }
+ return baseIsNative(value);
+ }
+
+ /**
+ * Checks if \`value\` is \`null\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is \`null\`, else \`false\`.
+ * @example
+ *
+ * _.isNull(null);
+ * // => true
+ *
+ * _.isNull(void 0);
+ * // => false
+ */
+ function isNull(value) {
+ return value === null;
+ }
+
+ /**
+ * Checks if \`value\` is \`null\` or \`undefined\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is nullish, else \`false\`.
+ * @example
+ *
+ * _.isNil(null);
+ * // => true
+ *
+ * _.isNil(void 0);
+ * // => true
+ *
+ * _.isNil(NaN);
+ * // => false
+ */
+ function isNil(value) {
+ return value == null;
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`Number\` primitive or object.
+ *
+ * **Note:** To exclude \`Infinity\`, \`-Infinity\`, and \`NaN\`, which are
+ * classified as numbers, use the \`_.isFinite\` method.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a number, else \`false\`.
+ * @example
+ *
+ * _.isNumber(3);
+ * // => true
+ *
+ * _.isNumber(Number.MIN_VALUE);
+ * // => true
+ *
+ * _.isNumber(Infinity);
+ * // => true
+ *
+ * _.isNumber('3');
+ * // => false
+ */
+ function isNumber(value) {
+ return typeof value == 'number' ||
+ (isObjectLike(value) && baseGetTag(value) == numberTag);
+ }
+
+ /**
+ * Checks if \`value\` is a plain object, that is, an object created by the
+ * \`Object\` constructor or one with a \`[[Prototype]]\` of \`null\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.8.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a plain object, else \`false\`.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * }
+ *
+ * _.isPlainObject(new Foo);
+ * // => false
+ *
+ * _.isPlainObject([1, 2, 3]);
+ * // => false
+ *
+ * _.isPlainObject({ 'x': 0, 'y': 0 });
+ * // => true
+ *
+ * _.isPlainObject(Object.create(null));
+ * // => true
+ */
+ function isPlainObject(value) {
+ if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
+ return false;
+ }
+ var proto = getPrototype(value);
+ if (proto === null) {
+ return true;
+ }
+ var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
+ return typeof Ctor == 'function' && Ctor instanceof Ctor &&
+ funcToString.call(Ctor) == objectCtorString;
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`RegExp\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.1.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a regexp, else \`false\`.
+ * @example
+ *
+ * _.isRegExp(/abc/);
+ * // => true
+ *
+ * _.isRegExp('/abc/');
+ * // => false
+ */
+ var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
+
+ /**
+ * Checks if \`value\` is a safe integer. An integer is safe if it's an IEEE-754
+ * double precision number which isn't the result of a rounded unsafe integer.
+ *
+ * **Note:** This method is based on
+ * [\`Number.isSafeInteger\`](https://mdn.io/Number/isSafeInteger).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a safe integer, else \`false\`.
+ * @example
+ *
+ * _.isSafeInteger(3);
+ * // => true
+ *
+ * _.isSafeInteger(Number.MIN_VALUE);
+ * // => false
+ *
+ * _.isSafeInteger(Infinity);
+ * // => false
+ *
+ * _.isSafeInteger('3');
+ * // => false
+ */
+ function isSafeInteger(value) {
+ return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`Set\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a set, else \`false\`.
+ * @example
+ *
+ * _.isSet(new Set);
+ * // => true
+ *
+ * _.isSet(new WeakSet);
+ * // => false
+ */
+ var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
+
+ /**
+ * Checks if \`value\` is classified as a \`String\` primitive or object.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a string, else \`false\`.
+ * @example
+ *
+ * _.isString('abc');
+ * // => true
+ *
+ * _.isString(1);
+ * // => false
+ */
+ function isString(value) {
+ return typeof value == 'string' ||
+ (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`Symbol\` primitive or object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a symbol, else \`false\`.
+ * @example
+ *
+ * _.isSymbol(Symbol.iterator);
+ * // => true
+ *
+ * _.isSymbol('abc');
+ * // => false
+ */
+ function isSymbol(value) {
+ return typeof value == 'symbol' ||
+ (isObjectLike(value) && baseGetTag(value) == symbolTag);
+ }
+
+ /**
+ * Checks if \`value\` is classified as a typed array.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a typed array, else \`false\`.
+ * @example
+ *
+ * _.isTypedArray(new Uint8Array);
+ * // => true
+ *
+ * _.isTypedArray([]);
+ * // => false
+ */
+ var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
+
+ /**
+ * Checks if \`value\` is \`undefined\`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is \`undefined\`, else \`false\`.
+ * @example
+ *
+ * _.isUndefined(void 0);
+ * // => true
+ *
+ * _.isUndefined(null);
+ * // => false
+ */
+ function isUndefined(value) {
+ return value === undefined;
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`WeakMap\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a weak map, else \`false\`.
+ * @example
+ *
+ * _.isWeakMap(new WeakMap);
+ * // => true
+ *
+ * _.isWeakMap(new Map);
+ * // => false
+ */
+ function isWeakMap(value) {
+ return isObjectLike(value) && getTag(value) == weakMapTag;
+ }
+
+ /**
+ * Checks if \`value\` is classified as a \`WeakSet\` object.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.3.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns \`true\` if \`value\` is a weak set, else \`false\`.
+ * @example
+ *
+ * _.isWeakSet(new WeakSet);
+ * // => true
+ *
+ * _.isWeakSet(new Set);
+ * // => false
+ */
+ function isWeakSet(value) {
+ return isObjectLike(value) && baseGetTag(value) == weakSetTag;
+ }
+
+ /**
+ * Checks if \`value\` is less than \`other\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.9.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is less than \`other\`,
+ * else \`false\`.
+ * @see _.gt
+ * @example
+ *
+ * _.lt(1, 3);
+ * // => true
+ *
+ * _.lt(3, 3);
+ * // => false
+ *
+ * _.lt(3, 1);
+ * // => false
+ */
+ var lt = createRelationalOperation(baseLt);
+
+ /**
+ * Checks if \`value\` is less than or equal to \`other\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.9.0
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns \`true\` if \`value\` is less than or equal to
+ * \`other\`, else \`false\`.
+ * @see _.gte
+ * @example
+ *
+ * _.lte(1, 3);
+ * // => true
+ *
+ * _.lte(3, 3);
+ * // => true
+ *
+ * _.lte(3, 1);
+ * // => false
+ */
+ var lte = createRelationalOperation(function(value, other) {
+ return value <= other;
+ });
+
+ /**
+ * Converts \`value\` to an array.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Array} Returns the converted array.
+ * @example
+ *
+ * _.toArray({ 'a': 1, 'b': 2 });
+ * // => [1, 2]
+ *
+ * _.toArray('abc');
+ * // => ['a', 'b', 'c']
+ *
+ * _.toArray(1);
+ * // => []
+ *
+ * _.toArray(null);
+ * // => []
+ */
+ function toArray(value) {
+ if (!value) {
+ return [];
+ }
+ if (isArrayLike(value)) {
+ return isString(value) ? stringToArray(value) : copyArray(value);
+ }
+ if (symIterator && value[symIterator]) {
+ return iteratorToArray(value[symIterator]());
+ }
+ var tag = getTag(value),
+ func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
+
+ return func(value);
+ }
+
+ /**
+ * Converts \`value\` to a finite number.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.12.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {number} Returns the converted number.
+ * @example
+ *
+ * _.toFinite(3.2);
+ * // => 3.2
+ *
+ * _.toFinite(Number.MIN_VALUE);
+ * // => 5e-324
+ *
+ * _.toFinite(Infinity);
+ * // => 1.7976931348623157e+308
+ *
+ * _.toFinite('3.2');
+ * // => 3.2
+ */
+ function toFinite(value) {
+ if (!value) {
+ return value === 0 ? value : 0;
+ }
+ value = toNumber(value);
+ if (value === INFINITY || value === -INFINITY) {
+ var sign = (value < 0 ? -1 : 1);
+ return sign * MAX_INTEGER;
+ }
+ return value === value ? value : 0;
+ }
+
+ /**
+ * Converts \`value\` to an integer.
+ *
+ * **Note:** This method is loosely based on
+ * [\`ToInteger\`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {number} Returns the converted integer.
+ * @example
+ *
+ * _.toInteger(3.2);
+ * // => 3
+ *
+ * _.toInteger(Number.MIN_VALUE);
+ * // => 0
+ *
+ * _.toInteger(Infinity);
+ * // => 1.7976931348623157e+308
+ *
+ * _.toInteger('3.2');
+ * // => 3
+ */
+ function toInteger(value) {
+ var result = toFinite(value),
+ remainder = result % 1;
+
+ return result === result ? (remainder ? result - remainder : result) : 0;
+ }
+
+ /**
+ * Converts \`value\` to an integer suitable for use as the length of an
+ * array-like object.
+ *
+ * **Note:** This method is based on
+ * [\`ToLength\`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {number} Returns the converted integer.
+ * @example
+ *
+ * _.toLength(3.2);
+ * // => 3
+ *
+ * _.toLength(Number.MIN_VALUE);
+ * // => 0
+ *
+ * _.toLength(Infinity);
+ * // => 4294967295
+ *
+ * _.toLength('3.2');
+ * // => 3
+ */
+ function toLength(value) {
+ return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
+ }
+
+ /**
+ * Converts \`value\` to a number.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to process.
+ * @returns {number} Returns the number.
+ * @example
+ *
+ * _.toNumber(3.2);
+ * // => 3.2
+ *
+ * _.toNumber(Number.MIN_VALUE);
+ * // => 5e-324
+ *
+ * _.toNumber(Infinity);
+ * // => Infinity
+ *
+ * _.toNumber('3.2');
+ * // => 3.2
+ */
+ function toNumber(value) {
+ if (typeof value == 'number') {
+ return value;
+ }
+ if (isSymbol(value)) {
+ return NAN;
+ }
+ if (isObject(value)) {
+ var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
+ value = isObject(other) ? (other + '') : other;
+ }
+ if (typeof value != 'string') {
+ return value === 0 ? value : +value;
+ }
+ value = value.replace(reTrim, '');
+ var isBinary = reIsBinary.test(value);
+ return (isBinary || reIsOctal.test(value))
+ ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
+ : (reIsBadHex.test(value) ? NAN : +value);
+ }
+
+ /**
+ * Converts \`value\` to a plain object flattening inherited enumerable string
+ * keyed properties of \`value\` to own properties of the plain object.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Object} Returns the converted plain object.
+ * @example
+ *
+ * function Foo() {
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.assign({ 'a': 1 }, new Foo);
+ * // => { 'a': 1, 'b': 2 }
+ *
+ * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
+ * // => { 'a': 1, 'b': 2, 'c': 3 }
+ */
+ function toPlainObject(value) {
+ return copyObject(value, keysIn(value));
+ }
+
+ /**
+ * Converts \`value\` to a safe integer. A safe integer can be compared and
+ * represented correctly.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {number} Returns the converted integer.
+ * @example
+ *
+ * _.toSafeInteger(3.2);
+ * // => 3
+ *
+ * _.toSafeInteger(Number.MIN_VALUE);
+ * // => 0
+ *
+ * _.toSafeInteger(Infinity);
+ * // => 9007199254740991
+ *
+ * _.toSafeInteger('3.2');
+ * // => 3
+ */
+ function toSafeInteger(value) {
+ return value
+ ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
+ : (value === 0 ? value : 0);
+ }
+
+ /**
+ * Converts \`value\` to a string. An empty string is returned for \`null\`
+ * and \`undefined\` values. The sign of \`-0\` is preserved.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {string} Returns the converted string.
+ * @example
+ *
+ * _.toString(null);
+ * // => ''
+ *
+ * _.toString(-0);
+ * // => '-0'
+ *
+ * _.toString([1, 2, 3]);
+ * // => '1,2,3'
+ */
+ function toString(value) {
+ return value == null ? '' : baseToString(value);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Assigns own enumerable string keyed properties of source objects to the
+ * destination object. Source objects are applied from left to right.
+ * Subsequent sources overwrite property assignments of previous sources.
+ *
+ * **Note:** This method mutates \`object\` and is loosely based on
+ * [\`Object.assign\`](https://mdn.io/Object/assign).
+ *
+ * @static
+ * @memberOf _
+ * @since 0.10.0
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns \`object\`.
+ * @see _.assignIn
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * }
+ *
+ * function Bar() {
+ * this.c = 3;
+ * }
+ *
+ * Foo.prototype.b = 2;
+ * Bar.prototype.d = 4;
+ *
+ * _.assign({ 'a': 0 }, new Foo, new Bar);
+ * // => { 'a': 1, 'c': 3 }
+ */
+ var assign = createAssigner(function(object, source) {
+ if (isPrototype(source) || isArrayLike(source)) {
+ copyObject(source, keys(source), object);
+ return;
+ }
+ for (var key in source) {
+ if (hasOwnProperty.call(source, key)) {
+ assignValue(object, key, source[key]);
+ }
+ }
+ });
+
+ /**
+ * This method is like \`_.assign\` except that it iterates over own and
+ * inherited source properties.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @alias extend
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns \`object\`.
+ * @see _.assign
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * }
+ *
+ * function Bar() {
+ * this.c = 3;
+ * }
+ *
+ * Foo.prototype.b = 2;
+ * Bar.prototype.d = 4;
+ *
+ * _.assignIn({ 'a': 0 }, new Foo, new Bar);
+ * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
+ */
+ var assignIn = createAssigner(function(object, source) {
+ copyObject(source, keysIn(source), object);
+ });
+
+ /**
+ * This method is like \`_.assignIn\` except that it accepts \`customizer\`
+ * which is invoked to produce the assigned values. If \`customizer\` returns
+ * \`undefined\`, assignment is handled by the method instead. The \`customizer\`
+ * is invoked with five arguments: (objValue, srcValue, key, object, source).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @alias extendWith
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} sources The source objects.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @returns {Object} Returns \`object\`.
+ * @see _.assignWith
+ * @example
+ *
+ * function customizer(objValue, srcValue) {
+ * return _.isUndefined(objValue) ? srcValue : objValue;
+ * }
+ *
+ * var defaults = _.partialRight(_.assignInWith, customizer);
+ *
+ * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+ * // => { 'a': 1, 'b': 2 }
+ */
+ var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
+ copyObject(source, keysIn(source), object, customizer);
+ });
+
+ /**
+ * This method is like \`_.assign\` except that it accepts \`customizer\`
+ * which is invoked to produce the assigned values. If \`customizer\` returns
+ * \`undefined\`, assignment is handled by the method instead. The \`customizer\`
+ * is invoked with five arguments: (objValue, srcValue, key, object, source).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} sources The source objects.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @returns {Object} Returns \`object\`.
+ * @see _.assignInWith
+ * @example
+ *
+ * function customizer(objValue, srcValue) {
+ * return _.isUndefined(objValue) ? srcValue : objValue;
+ * }
+ *
+ * var defaults = _.partialRight(_.assignWith, customizer);
+ *
+ * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+ * // => { 'a': 1, 'b': 2 }
+ */
+ var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
+ copyObject(source, keys(source), object, customizer);
+ });
+
+ /**
+ * Creates an array of values corresponding to \`paths\` of \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.0.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {...(string|string[])} [paths] The property paths to pick.
+ * @returns {Array} Returns the picked values.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+ *
+ * _.at(object, ['a[0].b.c', 'a[1]']);
+ * // => [3, 4]
+ */
+ var at = flatRest(baseAt);
+
+ /**
+ * Creates an object that inherits from the \`prototype\` object. If a
+ * \`properties\` object is given, its own enumerable string keyed properties
+ * are assigned to the created object.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.3.0
+ * @category Object
+ * @param {Object} prototype The object to inherit from.
+ * @param {Object} [properties] The properties to assign to the object.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * function Shape() {
+ * this.x = 0;
+ * this.y = 0;
+ * }
+ *
+ * function Circle() {
+ * Shape.call(this);
+ * }
+ *
+ * Circle.prototype = _.create(Shape.prototype, {
+ * 'constructor': Circle
+ * });
+ *
+ * var circle = new Circle;
+ * circle instanceof Circle;
+ * // => true
+ *
+ * circle instanceof Shape;
+ * // => true
+ */
+ function create(prototype, properties) {
+ var result = baseCreate(prototype);
+ return properties == null ? result : baseAssign(result, properties);
+ }
+
+ /**
+ * Assigns own and inherited enumerable string keyed properties of source
+ * objects to the destination object for all destination properties that
+ * resolve to \`undefined\`. Source objects are applied from left to right.
+ * Once a property is set, additional values of the same property are ignored.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns \`object\`.
+ * @see _.defaultsDeep
+ * @example
+ *
+ * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+ * // => { 'a': 1, 'b': 2 }
+ */
+ var defaults = baseRest(function(object, sources) {
+ object = Object(object);
+
+ var index = -1;
+ var length = sources.length;
+ var guard = length > 2 ? sources[2] : undefined;
+
+ if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+ length = 1;
+ }
+
+ while (++index < length) {
+ var source = sources[index];
+ var props = keysIn(source);
+ var propsIndex = -1;
+ var propsLength = props.length;
+
+ while (++propsIndex < propsLength) {
+ var key = props[propsIndex];
+ var value = object[key];
+
+ if (value === undefined ||
+ (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+ object[key] = source[key];
+ }
+ }
+ }
+
+ return object;
+ });
+
+ /**
+ * This method is like \`_.defaults\` except that it recursively assigns
+ * default properties.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.10.0
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns \`object\`.
+ * @see _.defaults
+ * @example
+ *
+ * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
+ * // => { 'a': { 'b': 2, 'c': 3 } }
+ */
+ var defaultsDeep = baseRest(function(args) {
+ args.push(undefined, customDefaultsMerge);
+ return apply(mergeWith, undefined, args);
+ });
+
+ /**
+ * This method is like \`_.find\` except that it returns the key of the first
+ * element \`predicate\` returns truthy for instead of the element itself.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {string|undefined} Returns the key of the matched element,
+ * else \`undefined\`.
+ * @example
+ *
+ * var users = {
+ * 'barney': { 'age': 36, 'active': true },
+ * 'fred': { 'age': 40, 'active': false },
+ * 'pebbles': { 'age': 1, 'active': true }
+ * };
+ *
+ * _.findKey(users, function(o) { return o.age < 40; });
+ * // => 'barney' (iteration order is not guaranteed)
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.findKey(users, { 'age': 1, 'active': true });
+ * // => 'pebbles'
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.findKey(users, ['active', false]);
+ * // => 'fred'
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.findKey(users, 'active');
+ * // => 'barney'
+ */
+ function findKey(object, predicate) {
+ return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
+ }
+
+ /**
+ * This method is like \`_.findKey\` except that it iterates over elements of
+ * a collection in the opposite order.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
+ * @returns {string|undefined} Returns the key of the matched element,
+ * else \`undefined\`.
+ * @example
+ *
+ * var users = {
+ * 'barney': { 'age': 36, 'active': true },
+ * 'fred': { 'age': 40, 'active': false },
+ * 'pebbles': { 'age': 1, 'active': true }
+ * };
+ *
+ * _.findLastKey(users, function(o) { return o.age < 40; });
+ * // => returns 'pebbles' assuming \`_.findKey\` returns 'barney'
+ *
+ * // The \`_.matches\` iteratee shorthand.
+ * _.findLastKey(users, { 'age': 36, 'active': true });
+ * // => 'barney'
+ *
+ * // The \`_.matchesProperty\` iteratee shorthand.
+ * _.findLastKey(users, ['active', false]);
+ * // => 'fred'
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.findLastKey(users, 'active');
+ * // => 'pebbles'
+ */
+ function findLastKey(object, predicate) {
+ return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
+ }
+
+ /**
+ * Iterates over own and inherited enumerable string keyed properties of an
+ * object and invokes \`iteratee\` for each property. The iteratee is invoked
+ * with three arguments: (value, key, object). Iteratee functions may exit
+ * iteration early by explicitly returning \`false\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.3.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ * @see _.forInRight
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forIn(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
+ */
+ function forIn(object, iteratee) {
+ return object == null
+ ? object
+ : baseFor(object, getIteratee(iteratee, 3), keysIn);
+ }
+
+ /**
+ * This method is like \`_.forIn\` except that it iterates over properties of
+ * \`object\` in the opposite order.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ * @see _.forIn
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forInRight(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'c', 'b', then 'a' assuming \`_.forIn\` logs 'a', 'b', then 'c'.
+ */
+ function forInRight(object, iteratee) {
+ return object == null
+ ? object
+ : baseForRight(object, getIteratee(iteratee, 3), keysIn);
+ }
+
+ /**
+ * Iterates over own enumerable string keyed properties of an object and
+ * invokes \`iteratee\` for each property. The iteratee is invoked with three
+ * arguments: (value, key, object). Iteratee functions may exit iteration
+ * early by explicitly returning \`false\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.3.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ * @see _.forOwnRight
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forOwn(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'a' then 'b' (iteration order is not guaranteed).
+ */
+ function forOwn(object, iteratee) {
+ return object && baseForOwn(object, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * This method is like \`_.forOwn\` except that it iterates over properties of
+ * \`object\` in the opposite order.
+ *
+ * @static
+ * @memberOf _
+ * @since 2.0.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns \`object\`.
+ * @see _.forOwn
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.forOwnRight(new Foo, function(value, key) {
+ * console.log(key);
+ * });
+ * // => Logs 'b' then 'a' assuming \`_.forOwn\` logs 'a' then 'b'.
+ */
+ function forOwnRight(object, iteratee) {
+ return object && baseForOwnRight(object, getIteratee(iteratee, 3));
+ }
+
+ /**
+ * Creates an array of function property names from own enumerable properties
+ * of \`object\`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns the function names.
+ * @see _.functionsIn
+ * @example
+ *
+ * function Foo() {
+ * this.a = _.constant('a');
+ * this.b = _.constant('b');
+ * }
+ *
+ * Foo.prototype.c = _.constant('c');
+ *
+ * _.functions(new Foo);
+ * // => ['a', 'b']
+ */
+ function functions(object) {
+ return object == null ? [] : baseFunctions(object, keys(object));
+ }
+
+ /**
+ * Creates an array of function property names from own and inherited
+ * enumerable properties of \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns the function names.
+ * @see _.functions
+ * @example
+ *
+ * function Foo() {
+ * this.a = _.constant('a');
+ * this.b = _.constant('b');
+ * }
+ *
+ * Foo.prototype.c = _.constant('c');
+ *
+ * _.functionsIn(new Foo);
+ * // => ['a', 'b', 'c']
+ */
+ function functionsIn(object) {
+ return object == null ? [] : baseFunctions(object, keysIn(object));
+ }
+
+ /**
+ * Gets the value at \`path\` of \`object\`. If the resolved value is
+ * \`undefined\`, the \`defaultValue\` is returned in its place.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.7.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @param {*} [defaultValue] The value returned for \`undefined\` resolved values.
+ * @returns {*} Returns the resolved value.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.get(object, 'a[0].b.c');
+ * // => 3
+ *
+ * _.get(object, ['a', '0', 'b', 'c']);
+ * // => 3
+ *
+ * _.get(object, 'a.b.c', 'default');
+ * // => 'default'
+ */
+ function get(object, path, defaultValue) {
+ var result = object == null ? undefined : baseGet(object, path);
+ return result === undefined ? defaultValue : result;
+ }
+
+ /**
+ * Checks if \`path\` is a direct property of \`object\`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @returns {boolean} Returns \`true\` if \`path\` exists, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': { 'b': 2 } };
+ * var other = _.create({ 'a': _.create({ 'b': 2 }) });
+ *
+ * _.has(object, 'a');
+ * // => true
+ *
+ * _.has(object, 'a.b');
+ * // => true
+ *
+ * _.has(object, ['a', 'b']);
+ * // => true
+ *
+ * _.has(other, 'a');
+ * // => false
+ */
+ function has(object, path) {
+ return object != null && hasPath(object, path, baseHas);
+ }
+
+ /**
+ * Checks if \`path\` is a direct or inherited property of \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @returns {boolean} Returns \`true\` if \`path\` exists, else \`false\`.
+ * @example
+ *
+ * var object = _.create({ 'a': _.create({ 'b': 2 }) });
+ *
+ * _.hasIn(object, 'a');
+ * // => true
+ *
+ * _.hasIn(object, 'a.b');
+ * // => true
+ *
+ * _.hasIn(object, ['a', 'b']);
+ * // => true
+ *
+ * _.hasIn(object, 'b');
+ * // => false
+ */
+ function hasIn(object, path) {
+ return object != null && hasPath(object, path, baseHasIn);
+ }
+
+ /**
+ * Creates an object composed of the inverted keys and values of \`object\`.
+ * If \`object\` contains duplicate values, subsequent values overwrite
+ * property assignments of previous values.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.7.0
+ * @category Object
+ * @param {Object} object The object to invert.
+ * @returns {Object} Returns the new inverted object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2, 'c': 1 };
+ *
+ * _.invert(object);
+ * // => { '1': 'c', '2': 'b' }
+ */
+ var invert = createInverter(function(result, value, key) {
+ if (value != null &&
+ typeof value.toString != 'function') {
+ value = nativeObjectToString.call(value);
+ }
+
+ result[value] = key;
+ }, constant(identity));
+
+ /**
+ * This method is like \`_.invert\` except that the inverted object is generated
+ * from the results of running each element of \`object\` thru \`iteratee\`. The
+ * corresponding inverted value of each inverted key is an array of keys
+ * responsible for generating the inverted value. The iteratee is invoked
+ * with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.1.0
+ * @category Object
+ * @param {Object} object The object to invert.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Object} Returns the new inverted object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2, 'c': 1 };
+ *
+ * _.invertBy(object);
+ * // => { '1': ['a', 'c'], '2': ['b'] }
+ *
+ * _.invertBy(object, function(value) {
+ * return 'group' + value;
+ * });
+ * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
+ */
+ var invertBy = createInverter(function(result, value, key) {
+ if (value != null &&
+ typeof value.toString != 'function') {
+ value = nativeObjectToString.call(value);
+ }
+
+ if (hasOwnProperty.call(result, value)) {
+ result[value].push(key);
+ } else {
+ result[value] = [key];
+ }
+ }, getIteratee);
+
+ /**
+ * Invokes the method at \`path\` of \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {...*} [args] The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
+ *
+ * _.invoke(object, 'a[0].b.c.slice', 1, 3);
+ * // => [2, 3]
+ */
+ var invoke = baseRest(baseInvoke);
+
+ /**
+ * Creates an array of the own enumerable property names of \`object\`.
+ *
+ * **Note:** Non-object values are coerced to objects. See the
+ * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+ * for more details.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.keys(new Foo);
+ * // => ['a', 'b'] (iteration order is not guaranteed)
+ *
+ * _.keys('hi');
+ * // => ['0', '1']
+ */
+ function keys(object) {
+ return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
+ }
+
+ /**
+ * Creates an array of the own and inherited enumerable property names of \`object\`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.keysIn(new Foo);
+ * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
+ */
+ function keysIn(object) {
+ return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
+ }
+
+ /**
+ * The opposite of \`_.mapValues\`; this method creates an object with the
+ * same values as \`object\` and keys generated by running each own enumerable
+ * string keyed property of \`object\` thru \`iteratee\`. The iteratee is invoked
+ * with three arguments: (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.8.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns the new mapped object.
+ * @see _.mapValues
+ * @example
+ *
+ * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
+ * return key + value;
+ * });
+ * // => { 'a1': 1, 'b2': 2 }
+ */
+ function mapKeys(object, iteratee) {
+ var result = {};
+ iteratee = getIteratee(iteratee, 3);
+
+ baseForOwn(object, function(value, key, object) {
+ baseAssignValue(result, iteratee(value, key, object), value);
+ });
+ return result;
+ }
+
+ /**
+ * Creates an object with the same keys as \`object\` and values generated
+ * by running each own enumerable string keyed property of \`object\` thru
+ * \`iteratee\`. The iteratee is invoked with three arguments:
+ * (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @since 2.4.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns the new mapped object.
+ * @see _.mapKeys
+ * @example
+ *
+ * var users = {
+ * 'fred': { 'user': 'fred', 'age': 40 },
+ * 'pebbles': { 'user': 'pebbles', 'age': 1 }
+ * };
+ *
+ * _.mapValues(users, function(o) { return o.age; });
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ *
+ * // The \`_.property\` iteratee shorthand.
+ * _.mapValues(users, 'age');
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ */
+ function mapValues(object, iteratee) {
+ var result = {};
+ iteratee = getIteratee(iteratee, 3);
+
+ baseForOwn(object, function(value, key, object) {
+ baseAssignValue(result, key, iteratee(value, key, object));
+ });
+ return result;
+ }
+
+ /**
+ * This method is like \`_.assign\` except that it recursively merges own and
+ * inherited enumerable string keyed properties of source objects into the
+ * destination object. Source properties that resolve to \`undefined\` are
+ * skipped if a destination value exists. Array and plain object properties
+ * are merged recursively. Other objects and value types are overridden by
+ * assignment. Source objects are applied from left to right. Subsequent
+ * sources overwrite property assignments of previous sources.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.5.0
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * var object = {
+ * 'a': [{ 'b': 2 }, { 'd': 4 }]
+ * };
+ *
+ * var other = {
+ * 'a': [{ 'c': 3 }, { 'e': 5 }]
+ * };
+ *
+ * _.merge(object, other);
+ * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
+ */
+ var merge = createAssigner(function(object, source, srcIndex) {
+ baseMerge(object, source, srcIndex);
+ });
+
+ /**
+ * This method is like \`_.merge\` except that it accepts \`customizer\` which
+ * is invoked to produce the merged values of the destination and source
+ * properties. If \`customizer\` returns \`undefined\`, merging is handled by the
+ * method instead. The \`customizer\` is invoked with six arguments:
+ * (objValue, srcValue, key, object, source, stack).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} sources The source objects.
+ * @param {Function} customizer The function to customize assigned values.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * function customizer(objValue, srcValue) {
+ * if (_.isArray(objValue)) {
+ * return objValue.concat(srcValue);
+ * }
+ * }
+ *
+ * var object = { 'a': [1], 'b': [2] };
+ * var other = { 'a': [3], 'b': [4] };
+ *
+ * _.mergeWith(object, other, customizer);
+ * // => { 'a': [1, 3], 'b': [2, 4] }
+ */
+ var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
+ baseMerge(object, source, srcIndex, customizer);
+ });
+
+ /**
+ * The opposite of \`_.pick\`; this method creates an object composed of the
+ * own and inherited enumerable property paths of \`object\` that are not omitted.
+ *
+ * **Note:** This method is considerably slower than \`_.pick\`.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {...(string|string[])} [paths] The property paths to omit.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': '2', 'c': 3 };
+ *
+ * _.omit(object, ['a', 'c']);
+ * // => { 'b': '2' }
+ */
+ var omit = flatRest(function(object, paths) {
+ var result = {};
+ if (object == null) {
+ return result;
+ }
+ var isDeep = false;
+ paths = arrayMap(paths, function(path) {
+ path = castPath(path, object);
+ isDeep || (isDeep = path.length > 1);
+ return path;
+ });
+ copyObject(object, getAllKeysIn(object), result);
+ if (isDeep) {
+ result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
+ }
+ var length = paths.length;
+ while (length--) {
+ baseUnset(result, paths[length]);
+ }
+ return result;
+ });
+
+ /**
+ * The opposite of \`_.pickBy\`; this method creates an object composed of
+ * the own and inherited enumerable string keyed properties of \`object\` that
+ * \`predicate\` doesn't return truthy for. The predicate is invoked with two
+ * arguments: (value, key).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {Function} [predicate=_.identity] The function invoked per property.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': '2', 'c': 3 };
+ *
+ * _.omitBy(object, _.isNumber);
+ * // => { 'b': '2' }
+ */
+ function omitBy(object, predicate) {
+ return pickBy(object, negate(getIteratee(predicate)));
+ }
+
+ /**
+ * Creates an object composed of the picked \`object\` properties.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {...(string|string[])} [paths] The property paths to pick.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': '2', 'c': 3 };
+ *
+ * _.pick(object, ['a', 'c']);
+ * // => { 'a': 1, 'c': 3 }
+ */
+ var pick = flatRest(function(object, paths) {
+ return object == null ? {} : basePick(object, paths);
+ });
+
+ /**
+ * Creates an object composed of the \`object\` properties \`predicate\` returns
+ * truthy for. The predicate is invoked with two arguments: (value, key).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The source object.
+ * @param {Function} [predicate=_.identity] The function invoked per property.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': '2', 'c': 3 };
+ *
+ * _.pickBy(object, _.isNumber);
+ * // => { 'a': 1, 'c': 3 }
+ */
+ function pickBy(object, predicate) {
+ if (object == null) {
+ return {};
+ }
+ var props = arrayMap(getAllKeysIn(object), function(prop) {
+ return [prop];
+ });
+ predicate = getIteratee(predicate);
+ return basePickBy(object, props, function(value, path) {
+ return predicate(value, path[0]);
+ });
+ }
+
+ /**
+ * This method is like \`_.get\` except that if the resolved value is a
+ * function it's invoked with the \`this\` binding of its parent object and
+ * its result is returned.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to resolve.
+ * @param {*} [defaultValue] The value returned for \`undefined\` resolved values.
+ * @returns {*} Returns the resolved value.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
+ *
+ * _.result(object, 'a[0].b.c1');
+ * // => 3
+ *
+ * _.result(object, 'a[0].b.c2');
+ * // => 4
+ *
+ * _.result(object, 'a[0].b.c3', 'default');
+ * // => 'default'
+ *
+ * _.result(object, 'a[0].b.c3', _.constant('default'));
+ * // => 'default'
+ */
+ function result(object, path, defaultValue) {
+ path = castPath(path, object);
+
+ var index = -1,
+ length = path.length;
+
+ // Ensure the loop is entered when path is empty.
+ if (!length) {
+ length = 1;
+ object = undefined;
+ }
+ while (++index < length) {
+ var value = object == null ? undefined : object[toKey(path[index])];
+ if (value === undefined) {
+ index = length;
+ value = defaultValue;
+ }
+ object = isFunction(value) ? value.call(object) : value;
+ }
+ return object;
+ }
+
+ /**
+ * Sets the value at \`path\` of \`object\`. If a portion of \`path\` doesn't exist,
+ * it's created. Arrays are created for missing index properties while objects
+ * are created for all other missing properties. Use \`_.setWith\` to customize
+ * \`path\` creation.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.7.0
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.set(object, 'a[0].b.c', 4);
+ * console.log(object.a[0].b.c);
+ * // => 4
+ *
+ * _.set(object, ['x', '0', 'y', 'z'], 5);
+ * console.log(object.x[0].y.z);
+ * // => 5
+ */
+ function set(object, path, value) {
+ return object == null ? object : baseSet(object, path, value);
+ }
+
+ /**
+ * This method is like \`_.set\` except that it accepts \`customizer\` which is
+ * invoked to produce the objects of \`path\`. If \`customizer\` returns \`undefined\`
+ * path creation is handled by the method instead. The \`customizer\` is invoked
+ * with three arguments: (nsValue, key, nsObject).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * var object = {};
+ *
+ * _.setWith(object, '[0][1]', 'a', Object);
+ * // => { '0': { '1': 'a' } }
+ */
+ function setWith(object, path, value, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ return object == null ? object : baseSet(object, path, value, customizer);
+ }
+
+ /**
+ * Creates an array of own enumerable string keyed-value pairs for \`object\`
+ * which can be consumed by \`_.fromPairs\`. If \`object\` is a map or set, its
+ * entries are returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @alias entries
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the key-value pairs.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.toPairs(new Foo);
+ * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
+ */
+ var toPairs = createToPairs(keys);
+
+ /**
+ * Creates an array of own and inherited enumerable string keyed-value pairs
+ * for \`object\` which can be consumed by \`_.fromPairs\`. If \`object\` is a map
+ * or set, its entries are returned.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @alias entriesIn
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the key-value pairs.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.toPairsIn(new Foo);
+ * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
+ */
+ var toPairsIn = createToPairs(keysIn);
+
+ /**
+ * An alternative to \`_.reduce\`; this method transforms \`object\` to a new
+ * \`accumulator\` object which is the result of running each of its own
+ * enumerable string keyed properties thru \`iteratee\`, with each invocation
+ * potentially mutating the \`accumulator\` object. If \`accumulator\` is not
+ * provided, a new object with the same \`[[Prototype]]\` will be used. The
+ * iteratee is invoked with four arguments: (accumulator, value, key, object).
+ * Iteratee functions may exit iteration early by explicitly returning \`false\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.3.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The custom accumulator value.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * _.transform([2, 3, 4], function(result, n) {
+ * result.push(n *= n);
+ * return n % 2 == 0;
+ * }, []);
+ * // => [4, 9]
+ *
+ * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
+ * (result[value] || (result[value] = [])).push(key);
+ * }, {});
+ * // => { '1': ['a', 'c'], '2': ['b'] }
+ */
+ function transform(object, iteratee, accumulator) {
+ var isArr = isArray(object),
+ isArrLike = isArr || isBuffer(object) || isTypedArray(object);
+
+ iteratee = getIteratee(iteratee, 4);
+ if (accumulator == null) {
+ var Ctor = object && object.constructor;
+ if (isArrLike) {
+ accumulator = isArr ? new Ctor : [];
+ }
+ else if (isObject(object)) {
+ accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
+ }
+ else {
+ accumulator = {};
+ }
+ }
+ (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
+ return iteratee(accumulator, value, index, object);
+ });
+ return accumulator;
+ }
+
+ /**
+ * Removes the property at \`path\` of \`object\`.
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to unset.
+ * @returns {boolean} Returns \`true\` if the property is deleted, else \`false\`.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 7 } }] };
+ * _.unset(object, 'a[0].b.c');
+ * // => true
+ *
+ * console.log(object);
+ * // => { 'a': [{ 'b': {} }] };
+ *
+ * _.unset(object, ['a', '0', 'b', 'c']);
+ * // => true
+ *
+ * console.log(object);
+ * // => { 'a': [{ 'b': {} }] };
+ */
+ function unset(object, path) {
+ return object == null ? true : baseUnset(object, path);
+ }
+
+ /**
+ * This method is like \`_.set\` except that accepts \`updater\` to produce the
+ * value to set. Use \`_.updateWith\` to customize \`path\` creation. The \`updater\`
+ * is invoked with one argument: (value).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.6.0
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {Function} updater The function to produce the updated value.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.update(object, 'a[0].b.c', function(n) { return n * n; });
+ * console.log(object.a[0].b.c);
+ * // => 9
+ *
+ * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
+ * console.log(object.x[0].y.z);
+ * // => 0
+ */
+ function update(object, path, updater) {
+ return object == null ? object : baseUpdate(object, path, castFunction(updater));
+ }
+
+ /**
+ * This method is like \`_.update\` except that it accepts \`customizer\` which is
+ * invoked to produce the objects of \`path\`. If \`customizer\` returns \`undefined\`
+ * path creation is handled by the method instead. The \`customizer\` is invoked
+ * with three arguments: (nsValue, key, nsObject).
+ *
+ * **Note:** This method mutates \`object\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.6.0
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {Function} updater The function to produce the updated value.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @returns {Object} Returns \`object\`.
+ * @example
+ *
+ * var object = {};
+ *
+ * _.updateWith(object, '[0][1]', _.constant('a'), Object);
+ * // => { '0': { '1': 'a' } }
+ */
+ function updateWith(object, path, updater, customizer) {
+ customizer = typeof customizer == 'function' ? customizer : undefined;
+ return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
+ }
+
+ /**
+ * Creates an array of the own enumerable string keyed property values of \`object\`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property values.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.values(new Foo);
+ * // => [1, 2] (iteration order is not guaranteed)
+ *
+ * _.values('hi');
+ * // => ['h', 'i']
+ */
+ function values(object) {
+ return object == null ? [] : baseValues(object, keys(object));
+ }
+
+ /**
+ * Creates an array of the own and inherited enumerable string keyed property
+ * values of \`object\`.
+ *
+ * **Note:** Non-object values are coerced to objects.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category Object
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property values.
+ * @example
+ *
+ * function Foo() {
+ * this.a = 1;
+ * this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.valuesIn(new Foo);
+ * // => [1, 2, 3] (iteration order is not guaranteed)
+ */
+ function valuesIn(object) {
+ return object == null ? [] : baseValues(object, keysIn(object));
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Clamps \`number\` within the inclusive \`lower\` and \`upper\` bounds.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Number
+ * @param {number} number The number to clamp.
+ * @param {number} [lower] The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the clamped number.
+ * @example
+ *
+ * _.clamp(-10, -5, 5);
+ * // => -5
+ *
+ * _.clamp(10, -5, 5);
+ * // => 5
+ */
+ function clamp(number, lower, upper) {
+ if (upper === undefined) {
+ upper = lower;
+ lower = undefined;
+ }
+ if (upper !== undefined) {
+ upper = toNumber(upper);
+ upper = upper === upper ? upper : 0;
+ }
+ if (lower !== undefined) {
+ lower = toNumber(lower);
+ lower = lower === lower ? lower : 0;
+ }
+ return baseClamp(toNumber(number), lower, upper);
+ }
+
+ /**
+ * Checks if \`n\` is between \`start\` and up to, but not including, \`end\`. If
+ * \`end\` is not specified, it's set to \`start\` with \`start\` then set to \`0\`.
+ * If \`start\` is greater than \`end\` the params are swapped to support
+ * negative ranges.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.3.0
+ * @category Number
+ * @param {number} number The number to check.
+ * @param {number} [start=0] The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns \`true\` if \`number\` is in the range, else \`false\`.
+ * @see _.range, _.rangeRight
+ * @example
+ *
+ * _.inRange(3, 2, 4);
+ * // => true
+ *
+ * _.inRange(4, 8);
+ * // => true
+ *
+ * _.inRange(4, 2);
+ * // => false
+ *
+ * _.inRange(2, 2);
+ * // => false
+ *
+ * _.inRange(1.2, 2);
+ * // => true
+ *
+ * _.inRange(5.2, 4);
+ * // => false
+ *
+ * _.inRange(-3, -2, -6);
+ * // => true
+ */
+ function inRange(number, start, end) {
+ start = toFinite(start);
+ if (end === undefined) {
+ end = start;
+ start = 0;
+ } else {
+ end = toFinite(end);
+ }
+ number = toNumber(number);
+ return baseInRange(number, start, end);
+ }
+
+ /**
+ * Produces a random number between the inclusive \`lower\` and \`upper\` bounds.
+ * If only one argument is provided a number between \`0\` and the given number
+ * is returned. If \`floating\` is \`true\`, or either \`lower\` or \`upper\` are
+ * floats, a floating-point number is returned instead of an integer.
+ *
+ * **Note:** JavaScript follows the IEEE-754 standard for resolving
+ * floating-point values which can produce unexpected results.
+ *
+ * @static
+ * @memberOf _
+ * @since 0.7.0
+ * @category Number
+ * @param {number} [lower=0] The lower bound.
+ * @param {number} [upper=1] The upper bound.
+ * @param {boolean} [floating] Specify returning a floating-point number.
+ * @returns {number} Returns the random number.
+ * @example
+ *
+ * _.random(0, 5);
+ * // => an integer between 0 and 5
+ *
+ * _.random(5);
+ * // => also an integer between 0 and 5
+ *
+ * _.random(5, true);
+ * // => a floating-point number between 0 and 5
+ *
+ * _.random(1.2, 5.2);
+ * // => a floating-point number between 1.2 and 5.2
+ */
+ function random(lower, upper, floating) {
+ if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
+ upper = floating = undefined;
+ }
+ if (floating === undefined) {
+ if (typeof upper == 'boolean') {
+ floating = upper;
+ upper = undefined;
+ }
+ else if (typeof lower == 'boolean') {
+ floating = lower;
+ lower = undefined;
+ }
+ }
+ if (lower === undefined && upper === undefined) {
+ lower = 0;
+ upper = 1;
+ }
+ else {
+ lower = toFinite(lower);
+ if (upper === undefined) {
+ upper = lower;
+ lower = 0;
+ } else {
+ upper = toFinite(upper);
+ }
+ }
+ if (lower > upper) {
+ var temp = lower;
+ lower = upper;
+ upper = temp;
+ }
+ if (floating || lower % 1 || upper % 1) {
+ var rand = nativeRandom();
+ return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
+ }
+ return baseRandom(lower, upper);
+ }
+
+ /*------------------------------------------------------------------------*/
+
+ /**
+ * Converts \`string\` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the camel cased string.
+ * @example
+ *
+ * _.camelCase('Foo Bar');
+ * // => 'fooBar'
+ *
+ * _.camelCase('--foo-bar--');
+ * // => 'fooBar'
+ *
+ * _.camelCase('__FOO_BAR__');
+ * // => 'fooBar'
+ */
+ var camelCase = createCompounder(function(result, word, index) {
+ word = word.toLowerCase();
+ return result + (index ? capitalize(word) : word);
+ });
+
+ /**
+ * Converts the first character of \`string\` to upper case and the remaining
+ * to lower case.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to capitalize.
+ * @returns {string} Returns the capitalized string.
+ * @example
+ *
+ * _.capitalize('FRED');
+ * // => 'Fred'
+ */
+ function capitalize(string) {
+ return upperFirst(toString(string).toLowerCase());
+ }
+
+ /**
+ * Deburrs \`string\` by converting
+ * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
+ * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
+ * letters to basic Latin letters and removing
+ * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to deburr.
+ * @returns {string} Returns the deburred string.
+ * @example
+ *
+ * _.deburr('déjà vu');
+ * // => 'deja vu'
+ */
+ function deburr(string) {
+ string = toString(string);
+ return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
+ }
+
+ /**
+ * Checks if \`string\` ends with the given target string.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to inspect.
+ * @param {string} [target] The string to search for.
+ * @param {number} [position=string.length] The position to search up to.
+ * @returns {boolean} Returns \`true\` if \`string\` ends with \`target\`,
+ * else \`false\`.
+ * @example
+ *
+ * _.endsWith('abc', 'c');
+ * // => true
+ *
+ * _.endsWith('abc', 'b');
+ * // => false
+ *
+ * _.endsWith('abc', 'b', 2);
+ * // => true
+ */
+ function endsWith(string, target, position) {
+ string = toString(string);
+ target = baseToString(target);
+
+ var length = string.length;
+ position = position === undefined
+ ? length
+ : baseClamp(toInteger(position), 0, length);
+
+ var end = position;
+ position -= target.length;
+ return position >= 0 && string.slice(position, end) == target;
+ }
+
+ /**
+ * Converts the characters \\"&\\", \\"<\\", \\">\\", '\\"', and \\"'\\" in \`string\` to their
+ * corresponding HTML entities.
+ *
+ * **Note:** No other characters are escaped. To escape additional
+ * characters use a third-party library like [_he_](https://mths.be/he).
+ *
+ * Though the \\">\\" character is escaped for symmetry, characters like
+ * \\">\\" and \\"/\\" don't need escaping in HTML and have no special meaning
+ * unless they're part of a tag or unquoted attribute value. See
+ * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
+ * (under \\"semi-related fun fact\\") for more details.
+ *
+ * When working with HTML you should always
+ * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
+ * XSS vectors.
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to escape.
+ * @returns {string} Returns the escaped string.
+ * @example
+ *
+ * _.escape('fred, barney, & pebbles');
+ * // => 'fred, barney, & pebbles'
+ */
+ function escape(string) {
+ string = toString(string);
+ return (string && reHasUnescapedHtml.test(string))
+ ? string.replace(reUnescapedHtml, escapeHtmlChar)
+ : string;
+ }
+
+ /**
+ * Escapes the \`RegExp\` special characters \\"^\\", \\"$\\", \\"\\\\\\", \\".\\", \\"*\\", \\"+\\",
+ * \\"?\\", \\"(\\", \\")\\", \\"[\\", \\"]\\", \\"{\\", \\"}\\", and \\"|\\" in \`string\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to escape.
+ * @returns {string} Returns the escaped string.
+ * @example
+ *
+ * _.escapeRegExp('[lodash](https://lodash.com/)');
+ * // => '\\\\[lodash\\\\]\\\\(https://lodash\\\\.com/\\\\)'
+ */
+ function escapeRegExp(string) {
+ string = toString(string);
+ return (string && reHasRegExpChar.test(string))
+ ? string.replace(reRegExpChar, '\\\\\\\\$&')
+ : string;
+ }
+
+ /**
+ * Converts \`string\` to
+ * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the kebab cased string.
+ * @example
+ *
+ * _.kebabCase('Foo Bar');
+ * // => 'foo-bar'
+ *
+ * _.kebabCase('fooBar');
+ * // => 'foo-bar'
+ *
+ * _.kebabCase('__FOO_BAR__');
+ * // => 'foo-bar'
+ */
+ var kebabCase = createCompounder(function(result, word, index) {
+ return result + (index ? '-' : '') + word.toLowerCase();
+ });
+
+ /**
+ * Converts \`string\`, as space separated words, to lower case.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the lower cased string.
+ * @example
+ *
+ * _.lowerCase('--Foo-Bar--');
+ * // => 'foo bar'
+ *
+ * _.lowerCase('fooBar');
+ * // => 'foo bar'
+ *
+ * _.lowerCase('__FOO_BAR__');
+ * // => 'foo bar'
+ */
+ var lowerCase = createCompounder(function(result, word, index) {
+ return result + (index ? ' ' : '') + word.toLowerCase();
+ });
+
+ /**
+ * Converts the first character of \`string\` to lower case.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the converted string.
+ * @example
+ *
+ * _.lowerFirst('Fred');
+ * // => 'fred'
+ *
+ * _.lowerFirst('FRED');
+ * // => 'fRED'
+ */
+ var lowerFirst = createCaseFirst('toLowerCase');
+
+ /**
+ * Pads \`string\` on the left and right sides if it's shorter than \`length\`.
+ * Padding characters are truncated if they can't be evenly divided by \`length\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.pad('abc', 8);
+ * // => ' abc '
+ *
+ * _.pad('abc', 8, '_-');
+ * // => '_-abc_-_'
+ *
+ * _.pad('abc', 3);
+ * // => 'abc'
+ */
+ function pad(string, length, chars) {
+ string = toString(string);
+ length = toInteger(length);
+
+ var strLength = length ? stringSize(string) : 0;
+ if (!length || strLength >= length) {
+ return string;
+ }
+ var mid = (length - strLength) / 2;
+ return (
+ createPadding(nativeFloor(mid), chars) +
+ string +
+ createPadding(nativeCeil(mid), chars)
+ );
+ }
+
+ /**
+ * Pads \`string\` on the right side if it's shorter than \`length\`. Padding
+ * characters are truncated if they exceed \`length\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.padEnd('abc', 6);
+ * // => 'abc '
+ *
+ * _.padEnd('abc', 6, '_-');
+ * // => 'abc_-_'
+ *
+ * _.padEnd('abc', 3);
+ * // => 'abc'
+ */
+ function padEnd(string, length, chars) {
+ string = toString(string);
+ length = toInteger(length);
+
+ var strLength = length ? stringSize(string) : 0;
+ return (length && strLength < length)
+ ? (string + createPadding(length - strLength, chars))
+ : string;
+ }
+
+ /**
+ * Pads \`string\` on the left side if it's shorter than \`length\`. Padding
+ * characters are truncated if they exceed \`length\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to pad.
+ * @param {number} [length=0] The padding length.
+ * @param {string} [chars=' '] The string used as padding.
+ * @returns {string} Returns the padded string.
+ * @example
+ *
+ * _.padStart('abc', 6);
+ * // => ' abc'
+ *
+ * _.padStart('abc', 6, '_-');
+ * // => '_-_abc'
+ *
+ * _.padStart('abc', 3);
+ * // => 'abc'
+ */
+ function padStart(string, length, chars) {
+ string = toString(string);
+ length = toInteger(length);
+
+ var strLength = length ? stringSize(string) : 0;
+ return (length && strLength < length)
+ ? (createPadding(length - strLength, chars) + string)
+ : string;
+ }
+
+ /**
+ * Converts \`string\` to an integer of the specified radix. If \`radix\` is
+ * \`undefined\` or \`0\`, a \`radix\` of \`10\` is used unless \`value\` is a
+ * hexadecimal, in which case a \`radix\` of \`16\` is used.
+ *
+ * **Note:** This method aligns with the
+ * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of \`parseInt\`.
+ *
+ * @static
+ * @memberOf _
+ * @since 1.1.0
+ * @category String
+ * @param {string} string The string to convert.
+ * @param {number} [radix=10] The radix to interpret \`value\` by.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {number} Returns the converted integer.
+ * @example
+ *
+ * _.parseInt('08');
+ * // => 8
+ *
+ * _.map(['6', '08', '10'], _.parseInt);
+ * // => [6, 8, 10]
+ */
+ function parseInt(string, radix, guard) {
+ if (guard || radix == null) {
+ radix = 0;
+ } else if (radix) {
+ radix = +radix;
+ }
+ return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
+ }
+
+ /**
+ * Repeats the given string \`n\` times.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to repeat.
+ * @param {number} [n=1] The number of times to repeat the string.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {string} Returns the repeated string.
+ * @example
+ *
+ * _.repeat('*', 3);
+ * // => '***'
+ *
+ * _.repeat('abc', 2);
+ * // => 'abcabc'
+ *
+ * _.repeat('abc', 0);
+ * // => ''
+ */
+ function repeat(string, n, guard) {
+ if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
+ n = 1;
+ } else {
+ n = toInteger(n);
+ }
+ return baseRepeat(toString(string), n);
+ }
+
+ /**
+ * Replaces matches for \`pattern\` in \`string\` with \`replacement\`.
+ *
+ * **Note:** This method is based on
+ * [\`String#replace\`](https://mdn.io/String/replace).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to modify.
+ * @param {RegExp|string} pattern The pattern to replace.
+ * @param {Function|string} replacement The match replacement.
+ * @returns {string} Returns the modified string.
+ * @example
+ *
+ * _.replace('Hi Fred', 'Fred', 'Barney');
+ * // => 'Hi Barney'
+ */
+ function replace() {
+ var args = arguments,
+ string = toString(args[0]);
+
+ return args.length < 3 ? string : string.replace(args[1], args[2]);
+ }
+
+ /**
+ * Converts \`string\` to
+ * [snake case](https://en.wikipedia.org/wiki/Snake_case).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the snake cased string.
+ * @example
+ *
+ * _.snakeCase('Foo Bar');
+ * // => 'foo_bar'
+ *
+ * _.snakeCase('fooBar');
+ * // => 'foo_bar'
+ *
+ * _.snakeCase('--FOO-BAR--');
+ * // => 'foo_bar'
+ */
+ var snakeCase = createCompounder(function(result, word, index) {
+ return result + (index ? '_' : '') + word.toLowerCase();
+ });
+
+ /**
+ * Splits \`string\` by \`separator\`.
+ *
+ * **Note:** This method is based on
+ * [\`String#split\`](https://mdn.io/String/split).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category String
+ * @param {string} [string=''] The string to split.
+ * @param {RegExp|string} separator The separator pattern to split by.
+ * @param {number} [limit] The length to truncate results to.
+ * @returns {Array} Returns the string segments.
+ * @example
+ *
+ * _.split('a-b-c', '-', 2);
+ * // => ['a', 'b']
+ */
+ function split(string, separator, limit) {
+ if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
+ separator = limit = undefined;
+ }
+ limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
+ if (!limit) {
+ return [];
+ }
+ string = toString(string);
+ if (string && (
+ typeof separator == 'string' ||
+ (separator != null && !isRegExp(separator))
+ )) {
+ separator = baseToString(separator);
+ if (!separator && hasUnicode(string)) {
+ return castSlice(stringToArray(string), 0, limit);
+ }
+ }
+ return string.split(separator, limit);
+ }
+
+ /**
+ * Converts \`string\` to
+ * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
+ *
+ * @static
+ * @memberOf _
+ * @since 3.1.0
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the start cased string.
+ * @example
+ *
+ * _.startCase('--foo-bar--');
+ * // => 'Foo Bar'
+ *
+ * _.startCase('fooBar');
+ * // => 'Foo Bar'
+ *
+ * _.startCase('__FOO_BAR__');
+ * // => 'FOO BAR'
+ */
+ var startCase = createCompounder(function(result, word, index) {
+ return result + (index ? ' ' : '') + upperFirst(word);
+ });
+
+ /**
+ * Checks if \`string\` starts with the given target string.
+ *
+ * @static
+ * @memberOf _
+ * @since 3.0.0
+ * @category String
+ * @param {string} [string=''] The string to inspect.
+ * @param {string} [target] The string to search for.
+ * @param {number} [position=0] The position to search from.
+ * @returns {boolean} Returns \`true\` if \`string\` starts with \`target\`,
+ * else \`false\`.
+ * @example
+ *
+ * _.startsWith('abc', 'a');
+ * // => true
+ *
+ * _.startsWith('abc', 'b');
+ * // => false
+ *
+ * _.startsWith('abc', 'b', 1);
+ * // => true
+ */
+ function startsWith(string, target, position) {
+ string = toString(string);
+ position = position == null
+ ? 0
+ : baseClamp(toInteger(position), 0, string.length);
+
+ target = baseToString(target);
+ return string.slice(position, position + target.length) == target;
+ }
+
+ /**
+ * Creates a compiled template function that can interpolate data properties
+ * in \\"interpolate\\" delimiters, HTML-escape interpolated data properties in
+ * \\"escape\\" delimiters, and execute JavaScript in \\"evaluate\\" delimiters. Data
+ * properties may be accessed as free variables in the template. If a setting
+ * object is given, it takes precedence over \`_.templateSettings\` values.
+ *
+ * **Note:** In the development build \`_.template\` utilizes
+ * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
+ * for easier debugging.
+ *
+ * For more information on precompiling templates see
+ * [lodash's custom builds documentation](https://lodash.com/custom-builds).
+ *
+ * For more information on Chrome extension sandboxes see
+ * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
+ *
+ * @static
+ * @since 0.1.0
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The template string.
+ * @param {Object} [options={}] The options object.
+ * @param {RegExp} [options.escape=_.templateSettings.escape]
+ * The HTML \\"escape\\" delimiter.
+ * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
+ * The \\"evaluate\\" delimiter.
+ * @param {Object} [options.imports=_.templateSettings.imports]
+ * An object to import into the template as free variables.
+ * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
+ * The \\"interpolate\\" delimiter.
+ * @param {string} [options.sourceURL='lodash.templateSources[n]']
+ * The sourceURL of the compiled template.
+ * @param {string} [options.variable='obj']
+ * The data object variable name.
+ * @param- {Object} [guard] Enables use as an iteratee for methods like \`_.map\`.
+ * @returns {Function} Returns the compiled template function.
+ * @example
+ *
+ * // Use the \\"interpolate\\" delimiter to create a compiled template.
+ * var compiled = _.template('hello <%= user %>!');
+ * compiled({ 'user': 'fred' });
+ * // => 'hello fred!'
+ *
+ * // Use the HTML \\"escape\\" delimiter to escape data property values.
+ * var compiled = _.template('<%- value %>');
+ * compiled({ 'value': '