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- 'use strict';
- var bind = require('../internals/function-bind-context');
- var IndexedObject = require('../internals/indexed-object');
- var toObject = require('../internals/to-object');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
-
- // `Array.prototype.{ findLast, findLastIndex }` methods implementation
- var createMethod = function (TYPE) {
- var IS_FIND_LAST_INDEX = TYPE === 1;
- return function ($this, callbackfn, that) {
- var O = toObject($this);
- var self = IndexedObject(O);
- var index = lengthOfArrayLike(self);
- var boundFunction = bind(callbackfn, that);
- var value, result;
- while (index-- > 0) {
- value = self[index];
- result = boundFunction(value, index, O);
- if (result) switch (TYPE) {
- case 0: return value; // findLast
- case 1: return index; // findLastIndex
- }
- }
- return IS_FIND_LAST_INDEX ? -1 : undefined;
- };
- };
-
- module.exports = {
- // `Array.prototype.findLast` method
- // https://github.com/tc39/proposal-array-find-from-last
- findLast: createMethod(0),
- // `Array.prototype.findLastIndex` method
- // https://github.com/tc39/proposal-array-find-from-last
- findLastIndex: createMethod(1)
- };
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