WeakSet.prototype.delete()

The delete() method removes the specified element from a WeakSet object.

ws.delete(value);

value

Required. The object remove from the WeakSet object.

true if an element in the WeakSet object has been removed successfully. false if the value is not found in the WeakSet or if the value is not an object.

var ws = new WeakSet();
var 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.

• WeakSet
• WeakSet.prototype.clear()