Weak Maps In Javascript Basic - Latest Information & Updates 2026

Web Reference: Feb 10, 2026 · 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. The WeakMap Object A JavaScript WeakMap is a collection of key/value pairs where the keys must be objects. A WeakMap holds weak references to its keys. Mar 19, 2026 · A WeakMap in JavaScript is a collection of key-value pairs where the keys are objects, and the values can be any arbitrary value. Unlike regular maps, WeakMap keys are weakly referenced, meaning they don't prevent garbage collection.

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