2 var IS_PURE = require('../internals/is-pure');
3 var $ = require('../internals/export');
4 var getBuiltIn = require('../internals/get-built-in');
5 var call = require('../internals/function-call');
6 var aCallable = require('../internals/a-callable');
7 var anObject = require('../internals/an-object');
8 var bind = require('../internals/function-bind-context');
9 var speciesConstructor = require('../internals/species-constructor');
10 var getSetIterator = require('../internals/get-set-iterator');
11 var iterate = require('../internals/iterate');
13 // `Set.prototype.filter` method
14 // https://github.com/tc39/proposal-collection-methods
15 $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
16 filter: function filter(callbackfn /* , thisArg */) {
17 var set = anObject(this);
18 var iterator = getSetIterator(set);
19 var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
20 var newSet = new (speciesConstructor(set, getBuiltIn('Set')))();
21 var adder = aCallable(newSet.add);
22 iterate(iterator, function (value) {
23 if (boundFunction(value, value, set)) call(adder, newSet, value);
24 }, { IS_ITERATOR: true });