Web Reference: WeakMap is an ES6 feature. ES6 is fully supported in all modern browsers since June 2017: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. 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. Mar 19, 2026 · Here’s a simple example demonstrating how to use a WeakMap in JavaScript. It shows how to associate object keys with values and how the garbage collector can remove key-value pairs when the key is no longer referenced.
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