1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 |
- 'use strict';
- var bind = require('../internals/function-bind-context');
- var uncurryThis = require('../internals/function-uncurry-this');
- var IndexedObject = require('../internals/indexed-object');
- var toObject = require('../internals/to-object');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var arraySpeciesCreate = require('../internals/array-species-create');
-
- var push = uncurryThis([].push);
-
- // `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterReject }` 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 IS_FILTER_REJECT = TYPE === 7;
- var NO_HOLES = TYPE === 5 || IS_FIND_INDEX;
- return function ($this, callbackfn, that, specificCreate) {
- var O = toObject($this);
- var self = IndexedObject(O);
- var length = lengthOfArrayLike(self);
- var boundFunction = bind(callbackfn, that);
- var index = 0;
- var create = specificCreate || arraySpeciesCreate;
- var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_REJECT ? create($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(target, value); // filter
- } else switch (TYPE) {
- case 4: return false; // every
- case 7: push(target, value); // filterReject
- }
- }
- }
- return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
- };
- };
-
- module.exports = {
- // `Array.prototype.forEach` method
- // https://tc39.es/ecma262/#sec-array.prototype.foreach
- forEach: createMethod(0),
- // `Array.prototype.map` method
- // https://tc39.es/ecma262/#sec-array.prototype.map
- map: createMethod(1),
- // `Array.prototype.filter` method
- // https://tc39.es/ecma262/#sec-array.prototype.filter
- filter: createMethod(2),
- // `Array.prototype.some` method
- // https://tc39.es/ecma262/#sec-array.prototype.some
- some: createMethod(3),
- // `Array.prototype.every` method
- // https://tc39.es/ecma262/#sec-array.prototype.every
- every: createMethod(4),
- // `Array.prototype.find` method
- // https://tc39.es/ecma262/#sec-array.prototype.find
- find: createMethod(5),
- // `Array.prototype.findIndex` method
- // https://tc39.es/ecma262/#sec-array.prototype.findIndex
- findIndex: createMethod(6),
- // `Array.prototype.filterReject` method
- // https://github.com/tc39/proposal-array-filtering
- filterReject: createMethod(7)
- };
|