2 var $ = require('../internals/export');
3 var IS_PURE = require('../internals/is-pure');
4 var anObject = require('../internals/an-object');
5 var getSetIterator = require('../internals/get-set-iterator');
6 var iterate = require('../internals/iterate');
8 // `Set.prototype.join` method
9 // https://github.com/tc39/proposal-collection-methods
10 $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
11 join: function join(separator) {
12 var set = anObject(this);
13 var iterator = getSetIterator(set);
14 var sep = separator === undefined ? ',' : String(separator);
16 iterate(iterator, result.push, { that: result, IS_ITERATOR: true });
17 return result.join(sep);