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66 lines
2.5 KiB
66 lines
2.5 KiB
4 years ago
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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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