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. Jun 7, 2024 · In this article, we explored how to create and use WeakMap and WeakSet, along with their common use cases, empowering you to write cleaner, more memory-efficient JavaScript code. Apr 2, 2015 · WeakMaps provide a way to extend objects from the outside without interfering with garbage collection. Whenever you want to extend an object but can't because it is sealed - or from an external source - a WeakMap can be applied.
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