| | |
| | | 'use strict'; |
| | | var $ = require('../internals/export'); |
| | | var IS_PURE = require('../internals/is-pure'); |
| | | var anObject = require('../internals/an-object'); |
| | | var bind = require('../internals/function-bind-context'); |
| | | var getMapIterator = require('../internals/get-map-iterator'); |
| | |
| | | |
| | | // `Map.prototype.findKey` method |
| | | // https://github.com/tc39/proposal-collection-methods |
| | | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, { |
| | | $({ target: 'Map', proto: true, real: true, forced: true }, { |
| | | findKey: function findKey(callbackfn /* , thisArg */) { |
| | | var map = anObject(this); |
| | | var iterator = getMapIterator(map); |
| | | var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3); |
| | | var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined); |
| | | return iterate(iterator, function (key, value, stop) { |
| | | if (boundFunction(value, key, map)) return stop(key); |
| | | }, { AS_ENTRIES: true, IS_ITERATOR: true, INTERRUPTED: true }).result; |