| var bind = require('../internals/bind-context'); |
| var IndexedObject = require('../internals/indexed-object'); |
| var toObject = require('../internals/to-object'); |
| var toLength = require('../internals/to-length'); |
| var arraySpeciesCreate = require('../internals/array-species-create'); |
| |
| var push = [].push; |
| |
| // `Array.prototype.{ forEach, map, filter, some, every, find, findIndex }` methods implementation |
| var createMethod = function (TYPE) { |
| var IS_MAP = TYPE == 1; |
| var IS_FILTER = TYPE == 2; |
| var IS_SOME = TYPE == 3; |
| var IS_EVERY = TYPE == 4; |
| var IS_FIND_INDEX = TYPE == 6; |
| var NO_HOLES = TYPE == 5 || IS_FIND_INDEX; |
| return function ($this, callbackfn, that, specificCreate) { |
| var O = toObject($this); |
| var self = IndexedObject(O); |
| var boundFunction = bind(callbackfn, that, 3); |
| var length = toLength(self.length); |
| var index = 0; |
| var create = specificCreate || arraySpeciesCreate; |
| var target = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined; |
| var value, result; |
| for (;length > index; index++) if (NO_HOLES || index in self) { |
| value = self[index]; |
| result = boundFunction(value, index, O); |
| if (TYPE) { |
| if (IS_MAP) target[index] = result; // map |
| else if (result) switch (TYPE) { |
| case 3: return true; // some |
| case 5: return value; // find |
| case 6: return index; // findIndex |
| case 2: push.call(target, value); // filter |
| } else if (IS_EVERY) return false; // every |
| } |
| } |
| return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target; |
| }; |
| }; |
| |
| module.exports = { |
| // `Array.prototype.forEach` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.foreach |
| forEach: createMethod(0), |
| // `Array.prototype.map` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.map |
| map: createMethod(1), |
| // `Array.prototype.filter` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.filter |
| filter: createMethod(2), |
| // `Array.prototype.some` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.some |
| some: createMethod(3), |
| // `Array.prototype.every` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.every |
| every: createMethod(4), |
| // `Array.prototype.find` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.find |
| find: createMethod(5), |
| // `Array.prototype.findIndex` method |
| // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex |
| findIndex: createMethod(6) |
| }; |