The WeakSet can only store Objects Like the WeakMap, the WeakSet cannot be looped through
Code
//ES6 Maps and Sets - The WeakSet;
let obj1 = {a:1};
let obj2 = {b:2};
let set = new WeakSet([obj1, obj2, obj1]);
set.add(obj2); // add to a weakset
set.delete(obj1); // delete from weakset
console.log(set.has(obj2)) // Check if a specific object exists in a set
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