2 var IS_PURE = require('../internals/is-pure');
3 var $ = require('../internals/export');
4 var getBuiltIn = require('../internals/get-built-in');
5 var bind = require('../internals/function-bind-context');
6 var call = require('../internals/function-call');
7 var aCallable = require('../internals/a-callable');
8 var anObject = require('../internals/an-object');
9 var speciesConstructor = require('../internals/species-constructor');
10 var getMapIterator = require('../internals/get-map-iterator');
11 var iterate = require('../internals/iterate');
13 // `Map.prototype.mapValues` method
14 // https://github.com/tc39/proposal-collection-methods
15 $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
16 mapValues: function mapValues(callbackfn /* , thisArg */) {
17 var map = anObject(this);
18 var iterator = getMapIterator(map);
19 var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
20 var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
21 var setter = aCallable(newMap.set);
22 iterate(iterator, function (key, value) {
23 call(setter, newMap, key, boundFunction(value, key, map));
24 }, { AS_ENTRIES: true, IS_ITERATOR: true });