WeakSet()

Baseline

20159

WeakSet() WeakSet

new WeakSet()
new WeakSet(iterable)

: WeakSet() new new TypeError

iterable: WeakSet null undefined

WeakSet

const ws = new WeakSet();
const foo = {};
const bar = {};

ws.add(foo);
ws.add(bar);

ws.has(foo); // true
ws.has(bar); // true

ws.delete(foo); // foo  set 
ws.has(foo); // false, foo 
ws.has(bar); // true, bar

foo !== bar set


ECMAScript 2027 LanguageSpecification # sec-weakset-constructor

WeakSet (core-js)
WeakSet

MDN

MDN 2026628

GitHub

WeakSet
1. WeakSet()
Object/Function
1. __proto__
2. constructor