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- 'use strict';
- var $ = require('../internals/export');
- var getBuiltIn = require('../internals/get-built-in');
- var bind = require('../internals/function-bind-context');
- var call = require('../internals/function-call');
- var aCallable = require('../internals/a-callable');
- var anObject = require('../internals/an-object');
- var speciesConstructor = require('../internals/species-constructor');
- var getMapIterator = require('../internals/get-map-iterator');
- var iterate = require('../internals/iterate');
- // `Map.prototype.mapValues` method
- // https://github.com/tc39/proposal-collection-methods
- $({ target: 'Map', proto: true, real: true, forced: true }, {
- mapValues: function mapValues(callbackfn /* , thisArg */) {
- var map = anObject(this);
- var iterator = getMapIterator(map);
- var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
- var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
- var setter = aCallable(newMap.set);
- iterate(iterator, function (key, value) {
- call(setter, newMap, key, boundFunction(value, key, map));
- }, { AS_ENTRIES: true, IS_ITERATOR: true });
- return newMap;
- }
- });
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