initial implementation of working transform with existing unit tests

__tests__/__fixtures__/bailout/early-return/output.js

@@ -1,12 +1,19 @@
-const _iterable = [1, 2, 3];
-const _fn = (value) => {
-  if (value === 2) {
+const _collection = [1, 2, 3];
+const _fn = (_value) => {
+  if (_value === 2) {
     return true;
   }
 };
-let _result = [];
-for (let _key = 0, _length = _iterable.length, _value; _key < _length; ++_key) {
-  _value = _iterable[_key];
-  if (_fn(_value, _key, _iterable)) _result.push(_value);
+const _results = [];
+for (
+  let _key = 0, _length = _collection.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
+  _value = _collection[_key];
+  _result = _fn(_value, _key, _collection);
+  if (_result) {
+    _results.push(_value);
+  }
 }
-const result = _result;
+const result = _results;

__tests__/__fixtures__/bailout/multiple-returns/output.js

@@ -1,13 +1,14 @@
-const _iterable = [1, 2, 3];
-const _fn = (value) => {
-  if (value === 2) {
+const _collection = [1, 2, 3];
+const _fn = (_value) => {
+  if (_value === 2) {
     return 82;
   }
-  return value;
+  return _value;
 };
-let _result = [];
-for (let _key = 0, _length = _iterable.length, _value; _key < _length; ++_key) {
-  _value = _iterable[_key];
-  _result[_key] = _fn(_value, _key, _iterable);
+const _length = _collection.length;
+const _results = Array(_length);
+for (let _key = 0, _value; _key < _length; ++_key) {
+  _value = _collection[_key];
+  _results[_key] = _fn(_value, _key, _collection);
 }
-const result = _result;
+const result = _results;

__tests__/__fixtures__/cached/every/output.js

@@ -1,9 +1,14 @@
-let _result = true;
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+let _determination = true;
+for (
+  let _key = 0, _length = array.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
   _value = array[_key];
-  if (!fn(_value, _key, array)) {
-    _result = false;
+  _result = fn(_value, _key, array);
+  if (!_result) {
+    _determination = false;
     break;
   }
 }
-const areAllEven = _result;
+const areAllEven = _determination;

__tests__/__fixtures__/cached/everyObject/output.js

@@ -1,10 +1,12 @@
-let _result = true;
-let _value;
-for (let _key in object) {
+let _determination = true,
+  _value,
+  _result;
+for (const _key in object) {
   _value = object[_key];
-  if (!fn(_value, _key, object)) {
-    _result = false;
+  _result = fn(_value, _key, object);
+  if (!_result) {
+    _determination = false;
     break;
   }
 }
-const areAllEven = _result;
+const areAllEven = _determination;

__tests__/__fixtures__/cached/everyRight/output.js

@@ -1,9 +1,10 @@
-let _result = true;
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
+let _determination = true;
+for (let _key = array.length, _value, _result; --_key >= 0; ) {
   _value = array[_key];
-  if (!fn(_value, _key, array)) {
-    _result = false;
+  _result = fn(_value, _key, array);
+  if (!_result) {
+    _determination = false;
     break;
   }
 }
-const areAllEven = _result;
+const areAllEven = _determination;

__tests__/__fixtures__/cached/filter/output.js

@@ -1,6 +1,13 @@
-let _result = [];
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+const _results = [];
+for (
+  let _key = 0, _length = array.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
   _value = array[_key];
-  if (fn(_value, _key, array)) _result.push(_value);
+  _result = fn(_value, _key, array);
+  if (_result) {
+    _results.push(_value);
+  }
 }
-const onlyEven = _result;
+const onlyEven = _results;

__tests__/__fixtures__/cached/filterObject/output.js

@@ -1,7 +1,10 @@
-let _result = {};
-let _value;
-for (let _key in object) {
+const _results = {};
+let _result, _value;
+for (const _key in object) {
   _value = object[_key];
-  if (fn(_value, _key, object)) _result[_key] = _value;
+  _result = fn(_value, _key, object);
+  if (_result) {
+    _results[_key] = _value;
+  }
 }
-const onlyEven = _result;
+const onlyEven = _results;

__tests__/__fixtures__/cached/filterRight/output.js

@@ -1,6 +1,10 @@
-let _result = [];
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
+const _results = [];
+let _result, _value;
+for (let _key = array.length, _value, _result; --_key >= 0; ) {
   _value = array[_key];
-  if (fn(_value, _key, array)) _result.push(_value);
+  _result = fn(_value, _key, array);
+  if (_result) {
+    _results.push(_value);
+  }
 }
-const onlyEven = _result;
+const onlyEven = _results;

__tests__/__fixtures__/cached/find/output.js

@@ -1,9 +1,14 @@
-let _result;
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+let _match;
+for (
+  let _key = 0, _length = array.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
   _value = array[_key];
-  if (fn(_value, _key, array)) {
-    _result = _value;
+  _result = fn(_value, _key, array);
+  if (_result) {
+    _match = _value;
     break;
   }
 }
-const firstEven = _result;
+const firstEven = _match;

__tests__/__fixtures__/cached/findIndex/output.js

@@ -1,9 +1,14 @@
-let _result = -1;
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+let _match = -1;
+for (
+  let _key = 0, _length = array.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
   _value = array[_key];
-  if (fn(_value, _key, array)) {
-    _result = _key;
+  _result = fn(_value, _key, array);
+  if (_result) {
+    _match = _key;
     break;
   }
 }
-const firstEven = _result;
+const firstEven = _match;

__tests__/__fixtures__/cached/findIndexRight/output.js

@@ -1,9 +1 @@
-let _result = -1;
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
-  _value = array[_key];
-  if (fn(_value, _key, array)) {
-    _result = _key;
-    break;
-  }
-}
-const firstEven = _result;
+const firstEven = findIndexRight(array, fn);

__tests__/__fixtures__/cached/findKey/output.js

@@ -1,10 +1,12 @@
-let _result;
-let _value;
-for (let _key in object) {
+let _match = -1,
+  _value,
+  _result;
+for (const _key in object) {
   _value = object[_key];
-  if (fn(_value, _key, object)) {
-    _result = _key;
+  _result = fn(_value, _key, object);
+  if (_result) {
+    _match = _key;
     break;
   }
 }
-const firstEven = _result;
+const firstEven = _match;

__tests__/__fixtures__/cached/findObject/output.js

@@ -1,10 +1,10 @@
-let _result;
-let _value;
-for (let _key in object) {
+let _match, _value, _result;
+for (const _key in object) {
   _value = object[_key];
-  if (fn(_value, _key, object)) {
-    _result = _value;
+  _result = fn(_value, _key, object);
+  if (_result) {
+    _match = _value;
     break;
   }
 }
-const firstEven = _result;
+const firstEven = _match;

__tests__/__fixtures__/cached/findRight/output.js

@@ -1,9 +1 @@
-let _result;
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
-  _value = array[_key];
-  if (fn(_value, _key, array)) {
-    _result = _value;
-    break;
-  }
-}
-const lastEven = _result;
+const lastEven = findRight(array, fn);

__tests__/__fixtures__/cached/flatMap/output.js

@@ -1,6 +1,11 @@
-let _result = [];
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+let _results = [];
+for (
+  let _key = 0, _length = array.length, _value, _result;
+  _key < _length;
+  ++_key
+) {
   _value = array[_key];
-  _result.push.apply(_result, fn(_value, _key, array));
+  _result = fn(_value, _key, array);
+  _results = _results.concat(_result);
 }
-const flattened = _result;
+const flattened = _results;

__tests__/__fixtures__/cached/flatMapRight/output.js

@@ -1,6 +1,7 @@
-let _result = [];
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
+let _results = [];
+for (let _key = array.length, _value, _result; --_key >= 0; ) {
   _value = array[_key];
-  _result.push.apply(_result, fn(_value, _key, array));
+  _result = fn(_value, _key, array);
+  _results = _results.concat(_result);
 }
-const flattened = _result;
+const flattened = _results;

__tests__/__fixtures__/cached/forEachObject/output.js

@@ -1,5 +1,5 @@
 let _value;
-for (let _key in object) {
+for (const _key in object) {
   _value = object[_key];
   fn(_value, _key, object);
 }

__tests__/__fixtures__/cached/forEachRight/output.js

@@ -1,4 +1,4 @@
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
+for (let _key = array.length, _value; --_key >= 0; ) {
   _value = array[_key];
   fn(_value, _key, array);
 }

__tests__/__fixtures__/cached/map/output.js

@@ -1,6 +1,7 @@
-let _result = [];
-for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
+const _length = array.length;
+const _results = Array(_length);
+for (let _key = 0, _value; _key < _length; ++_key) {
   _value = array[_key];
-  _result[_key] = fn(_value, _key, array);
+  _results[_key] = fn(_value, _key, array);
 }
-const doubledValues = _result;
+const doubledValues = _results;

__tests__/__fixtures__/cached/mapObject/output.js

@@ -1,7 +1,7 @@
-let _result = {};
-let _value;
-for (let _key in object) {
+const _results = {};
+let _value, _result;
+for (const _key in object) {
   _value = object[_key];
-  _result[_key] = fn(_value, _key, object);
+  _results[_key] = fn(_value, _key, object);
 }
-const doubledValues = _result;
+const doubledValues = _results;

__tests__/__fixtures__/cached/mapRight/output.js

@@ -1,6 +1,8 @@
-let _result = [];
-for (let _key = array.length - 1, _value; _key >= 0; --_key) {
+const _length = array.length;
+let _key = _length;
+const _results = Array(_length);
+for (let _value; --_key >= 0; ) {
   _value = array[_key];
-  _result[_result.length] = fn(_value, _key, array);
+  _results[_length - _key - 1] = fn(_value, _key, array);
 }
-const doubledValues = _result;
+const doubledValues = _results;

__tests__/__fixtures__/cached/reduce-no-initialValue/output.js

@@ -1,6 +1,6 @@
-let _result = array[0];
+let _accumulated = array[0];
 for (let _key = 1, _length = array.length, _value; _key < _length; ++_key) {
   _value = array[_key];
-  _result = fn(_result, _value, _key, array);
+  _accumulated = fn(_accumulated, _value, _key, array);
 }
-const doubledValues = _result;
+const doubledValues = _accumulated;

__tests__/__fixtures__/cached/reduce/output.js

@@ -1,6 +1,6 @@
-let _result = {};
+let _accumulated = {};
 for (let _key = 0, _length = array.length, _value; _key < _length; ++_key) {
   _value = array[_key];
-  _result = fn(_result, _value, _key, array);
+  _accumulated = fn(_accumulated, _value, _key, array);
 }
-const doubledValues = _result;
+const doubledValues = _accumulated;