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Filename :
esnext.map.map-values.js
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'use strict'; var $ = require('../internals/export'); var bind = require('../internals/function-bind-context'); var aMap = require('../internals/a-map'); var MapHelpers = require('../internals/map-helpers'); var iterate = require('../internals/map-iterate'); var Map = MapHelpers.Map; var set = MapHelpers.set; // `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 = aMap(this); var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined); var newMap = new Map(); iterate(map, function (value, key) { set(newMap, key, boundFunction(value, key, map)); }); return newMap; } });