What is `WeakSet` in JavaScript and how does it differ from `Set`?

Explanation

WeakSet in JavaScript only holds objects with weak references, allowing for garbage collection. It is non-iterable and lacks a size property. On the other hand, Set can store any value type, holds strong references, is iterable, and has a size property.

Key points

WeakSet holds objects with weak references
WeakSet is non-iterable and lacks a size property
Set can store any value type and is iterable with a size property

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