modified: bin/concat.js

modified:   index.js
new file:   package-lock.json
modified:   package.json
new file:   test/array.from.test.jsx

Author: fabianmoronzirfas

bin/concat.js

@@ -1,19 +1,18 @@
 const folders = ['./Array/', './Function/', './Object/', './String/'];
-// const testFolder = './Array/';
 const fs = require('fs');
 const path = require('path');
 const cat = require('cat');
 const bundlePath = path.resolve(process.cwd(), './index.js');
-
 // clear the file
 fs.writeFileSync(path.resolve(process.cwd(), bundlePath), '');
 // loop folders
 folders.forEach(folder => {
   fs.readdir(folder, (err, files) => {
     files.forEach(file => {
-      // console.log(file);
       let filePath = path.resolve(process.cwd(), `${folder}${file}`);
-      // console.log(filePath);
+      if(file === '.gitkeep') {
+        return;
+      }
       cat(filePath, (error, data)=>{
         if(error !== null) {
           console.log(error);
@@ -23,5 +22,4 @@ folders.forEach(folder => {
       });
     });
   });
-
 });

index.js

@@ -1,8 +1,82 @@
-//.gitkeep
+//from.js
+// Production steps of ECMA-262, Edition 6, 22.1.2.1
+if (!Array.from) {
+  Array.from = (function () {
+    var toStr = Object.prototype.toString;
+    var isCallable = function (fn) {
+      return typeof fn === 'function' || toStr.call(fn) === '[object Function]';
+    };
+    var toInteger = function (value) {
+      var number = Number(value);
+      if (isNaN(number)) { return 0; }
+      if (number === 0 || !isFinite(number)) { return number; }
+      return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
+    };
+    var maxSafeInteger = Math.pow(2, 53) - 1;
+    var toLength = function (value) {
+      var len = toInteger(value);
+      return Math.min(Math.max(len, 0), maxSafeInteger);
+    };
 
-//.gitkeep
+    // The length property of the from method is 1.
+    return function from(arrayLike/*, mapFn, thisArg */) {
+      // 1. Let C be the this value.
+      var C = this;
 
-//.gitkeep
+      // 2. Let items be ToObject(arrayLike).
+      var items = Object(arrayLike);
+
+      // 3. ReturnIfAbrupt(items).
+      if (arrayLike == null) {
+        throw new TypeError('Array.from requires an array-like object - not null or undefined');
+      }
+
+      // 4. If mapfn is undefined, then let mapping be false.
+      var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
+      var T;
+      if (typeof mapFn !== 'undefined') {
+        // 5. else
+        // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
+        if (!isCallable(mapFn)) {
+          throw new TypeError('Array.from: when provided, the second argument must be a function');
+        }
+
+        // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
+        if (arguments.length > 2) {
+          T = arguments[2];
+        }
+      }
+
+      // 10. Let lenValue be Get(items, "length").
+      // 11. Let len be ToLength(lenValue).
+      var len = toLength(items.length);
+
+      // 13. If IsConstructor(C) is true, then
+      // 13. a. Let A be the result of calling the [[Construct]] internal method 
+      // of C with an argument list containing the single item len.
+      // 14. a. Else, Let A be ArrayCreate(len).
+      var A = isCallable(C) ? Object(new C(len)) : new Array(len);
+
+      // 16. Let k be 0.
+      var k = 0;
+      // 17. Repeat, while k < len… (also steps a - h)
+      var kValue;
+      while (k < len) {
+        kValue = items[k];
+        if (mapFn) {
+          A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k);
+        } else {
+          A[k] = kValue;
+        }
+        k += 1;
+      }
+      // 18. Let putStatus be Put(A, "length", len, true).
+      A.length = len;
+      // 20. Return A.
+      return A;
+    };
+  }());
+}
 
 //assign.js
 /**

package-lock.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "bundle":"node bin/concat.js"
+    "bundle": "node bin/concat.js"
   },
   "repository": {
     "type": "git",

package.json

@@ -0,0 +1,8 @@
+#include "../Array/from.js"
+$.writeln(Array.from("foo"));
+// => f,o,o
+#target "indesign"
+var doc = app.documents.add();
+doc.pages.add();
+$.writeln(Array.from());
+// => [object Page], [object Page]