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53. What are WeakSet and WeakMap?

WeakMap and WeakSet are two built-in collections in JavaScript that store weak references to object keys and object values, respectively.

The main difference between WeakMap and Map, or WeakSet and Set, is that the former do not prevent the garbage collector from collecting the object if there are no other references to it.

In other words, if an object is used as a key or value in WeakMap or WeakSet, and it becomes unreachable from the code, it will be automatically deleted from the collection.

This can be useful in situations where a developer wants to associate additional information with an object without preventing it from being garbage collected when it's not needed anymore. For example, a WeakMap could be used to store caches for objects that are expensive to compute, but are not guaranteed to be needed throughout the life cycle of the application.