WeakSet.prototype.delete()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.
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
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 |
Browser compatibility
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