WeakSet.prototype.delete()

The delete() method of WeakSet instances removes the specified value from this set, if it is in the set.

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

value

The value to remove from the WeakSet object. Objects are compared by reference, not by value.

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

undefined

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

See also