Use

This module exports the native Set object if Set is present. If not, a Set-like constructor function is exported that supports O(1) insertion and deletion by adding a can-cid property to objects passed to .set.

var Set = require("can-util/js/cid-set/cid-set");

var map = new set();

var obj = {};

map.add(obj);
map.has(obj) //-> true;

The following methods and properties are supported by the polyfill:

• clear()
• delete(value)
• forEach(callback[,thisArg])
• get(value)
• has(value)
• add(value)
• size