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