WeakSet.prototype.delete() - JavaScript | MDN
Try it
const weakset = new WeakSet();
const object = {};
weakset.add(object);
console.log(weakset.has(object));
// Expected output: true
weakset.delete(object);
console.log(weakset.has(object));
// Expected output: false
Syntax
js
weakSetInstance.delete(value)
Parameters
Return value
true if a value in the WeakSet object has been removed successfully. false if the value is not found in the WeakSet. Always returns false if value is not an object or a non-registered symbol.
Examples
Using delete()
js
const ws = new WeakSet();
const obj = {};
ws.add(window);
ws.delete(obj); // Returns false. No obj found to be deleted.
ws.delete(window); // Returns true. Successfully removed.
ws.has(window); // Returns false. The window is no longer present in the WeakSet.
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-weakset.prototype.delete |