2 var $ = require('../internals/export');
3 var IS_PURE = require('../internals/is-pure');
4 var getBuiltIn = require('../internals/get-built-in');
5 var anObject = require('../internals/an-object');
6 var aFunction = require('../internals/a-function');
7 var getIterator = require('../internals/get-iterator');
8 var iterate = require('../internals/iterate');
10 // `Set.prototype.isSubsetOf` method
11 // https://tc39.github.io/proposal-set-methods/#Set.prototype.isSubsetOf
12 $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
13 isSubsetOf: function isSubsetOf(iterable) {
14 var iterator = getIterator(this);
15 var otherSet = anObject(iterable);
16 var hasCheck = otherSet.has;
17 if (typeof hasCheck != 'function') {
18 otherSet = new (getBuiltIn('Set'))(iterable);
19 hasCheck = aFunction(otherSet.has);
21 return !iterate(iterator, function (value, stop) {
22 if (hasCheck.call(otherSet, value) === false) return stop();
23 }, { IS_ITERATOR: true, INTERRUPTED: true }).stopped;