In javascript, Set is a collection of unique and ordered elements.

Just like Set, WeakSet is also a collection of unique and ordered elements with some key differences:

Weakset contains only objects and no other type.

An object inside the weakset is referenced weakly. This means, if the object inside the weakset does not have a reference, it will be garbage collected.

Unlike Set, WeakSet only has three methods, add() , delete() and has() .