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Viewing file:     esnext.map.map-keys.js (1.14 KB)      -rwxrwxrwx

'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.mapKeys` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: true }, {
  mapKeys: function mapKeys(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, boundFunction(value, key, map), value);
    }, { AS_ENTRIES: true, IS_ITERATOR: true });
    return newMap;
  }
});