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. 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. 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).
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Net Worth Profile Overview
50 Javascript Weakmap What Is Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $12M - $18M
Salary & Income Sources
Career Highlights & Achievements
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Last Updated: April 7, 2026
Net Worth Outlook & Future Earnings
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