Weakmap Vs Map In Javascript - Latest Information & Updates 2026

Web Reference: Jul 23, 2025 · In a Weak Map, every key can only be an object and function. It used to store weak object references. Maps are iterable. WeakMaps are not iterable. Maps will keep everything even if you don't use them. WeakMaps holds the reference to the key, not the key itself. Mar 24, 2013 · The data in the Map will be preserved since it can still be referenced with methods that a WeakMap does not have. Summary: WeakMap will better optimize memory usage if you do not need to iterate or list the Map's entries. A WeakMap is a collection of key/value pairs whose keys must be objects or non-registered symbols, with values of any arbitrary JavaScript type, and which does not create strong references to its keys. That is, an object's presence as a key in a WeakMap does not prevent the object from being garbage collected. Once an object used as a key has been collected, its corresponding values in any WeakMap become candidates for garbage collection as well — as long as they aren't strongly referred to elsewhere. The only primitive type that can be used as a WeakMap key is symbol — more specifically, non-registered symbols — because non-registered symbols are guaranteed to be unique and cannot be re-created.

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