2 var weak = require('./_collection-weak');
4 // 23.4 WeakSet Objects
5 require('./_collection')('WeakSet', function(get){
6 return function WeakSet(){ return get(this, arguments.length > 0 ? arguments[0] : undefined); };
8 // 23.4.3.1 WeakSet.prototype.add(value)
9 add: function add(value){
10 return weak.def(this, value, true);
12 }, weak, false, true);