| 'use strict'; |
| var $ = require('../internals/export'); |
| var IS_PURE = require('../internals/is-pure'); |
| var anObject = require('../internals/an-object'); |
| var getMapIterator = require('../internals/get-map-iterator'); |
| var iterate = require('../internals/iterate'); |
| |
| // `Map.prototype.includes` method |
| // https://github.com/tc39/proposal-collection-methods |
| $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, { |
| keyOf: function keyOf(searchElement) { |
| return iterate(getMapIterator(anObject(this)), function (key, value) { |
| if (value === searchElement) return iterate.stop(key); |
| }, undefined, true, true).result; |
| } |
| }); |