2 var IS_PURE = require('../internals/is-pure');
3 var $ = require('../internals/export');
4 var uncurryThis = require('../internals/function-uncurry-this');
5 var anObject = require('../internals/an-object');
6 var toString = require('../internals/to-string');
7 var getSetIterator = require('../internals/get-set-iterator');
8 var iterate = require('../internals/iterate');
10 var arrayJoin = uncurryThis([].join);
13 // `Set.prototype.join` method
14 // https://github.com/tc39/proposal-collection-methods
15 $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
16 join: function join(separator) {
17 var set = anObject(this);
18 var iterator = getSetIterator(set);
19 var sep = separator === undefined ? ',' : toString(separator);
21 iterate(iterator, push, { that: result, IS_ITERATOR: true });
22 return arrayJoin(result, sep);