Sha256: 2815c1c1bc03003618297d3b36e0d81c711eab17c6da8f331fa54a2bd57fea6c
Contents?: true
Size: 1.12 KB
Versions: 12
Compression:
Stored size: 1.12 KB
Contents
'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var getBuiltIn = require('../internals/get-built-in');
var anObject = require('../internals/an-object');
var aFunction = require('../internals/a-function');
var bind = require('../internals/bind-context');
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: IS_PURE }, {
mapKeys: function mapKeys(callbackfn /* , thisArg */) {
var map = anObject(this);
var iterator = getMapIterator(map);
var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
var setter = aFunction(newMap.set);
iterate(iterator, function (key, value) {
setter.call(newMap, boundFunction(value, key, map), value);
}, undefined, true, true);
return newMap;
}
});
Version data entries
12 entries across 12 versions & 4 rubygems