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