var bind = require('../internals/function-bind-context'); var IndexedObject = require('../internals/indexed-object'); var toObject = require('../internals/to-object'); var toLength = require('../internals/to-length'); // `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 boundFunction = bind(callbackfn, that, 3); var index = toLength(self.length); 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) };