Access to WeakMap items

Question

Why is there no direct access to items in WeakMap? And when the garbage collector deletes the link that is the key to WeakMap then also the value that was tied to this key is deleted?

Answer 1

By "direct access to items", I assume you mean why they are not enumerable? Here's the MDN explanation:

Because of references being weak, WeakMap keys are not enumerable (i.e. there is no method giving you a list of the keys). If they were, the list would depend on the state of garbage collection, introducing non-determinism. If you want to have a list of keys, you should use a Map.

I am not sure I understand the second part of the question. An entry (i.e. key-value pair) is eligible to be deleted from the WeakMap if there are no non-weak references to the key. What happens to the value would be the same as what happens if it were deleted from Map, or from anywhere else: if it was the last non-weak reference to that value, it becomes eligible for garbage collection. However, as long as the entry (the key-value pair) is surviving in a WeakMap, the value is considered to be referenced, and will not be garbage-collected.