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. Learn the different between ES6 Maps and WeakMaps with this video! WeakMap was intentionally designed for privacy: you can set, get, has, and delete using an object key, but not inspect what is inside. This was a great tool for simulating private properties in JavaScript classes (before #private fields were added to the language). WeakMap is an ES6 feature.
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