WeakSet

• References to keys/values held weakly

• Do not prevent garbage collection

• Small api ( add, delete, check for values ) compared to set/map

• cann't be iterated

Note

• keys must be objects

• the values can be arbitrary values.

var ws = new WeakSet();
ws.add()
ws.delete()
ws.has()

No clear() method on weakset

As if their is no reference to object wekset runs garbage collection so we have no need to worry about it

let dog1 = {name: 'tomy'};
let dog2 = {name: 'fluffy'};

const ws = new WeakSet([dog1, dog2]);
console.log(ws); // WeakSet {Object {name: "fluffy"}, Object {name: "tomy"}}

dog1 =null;

console.log(ws); // WeakSet {Object {name: "fluffy"}}, after some tome

WeakSet Demo

var ws = new WeakSet();
var age = {age: 20};
ws.add({name: 'hemant'}).add(age);
console.log(ws.delete(age)); // true
console.log(ws.has(age)); // false
console.log(ws); // WeakSet {Object {name: "hemant"}}