WeakSet
Widely available since 2018-03-30
A WeakSet object stores unique values of any type without creating strong references to the values, such that membership in the set does not prevent garbage collection of the value.
Learning resources on MDN
Browser support
- Chrome 36 Released on 2014-07-16
- Chrome Android 36 Released on 2014-07-16
- Edge 12 Released on 2015-07-29
- Firefox 34 Released on 2014-12-01
- Firefox for Android 34 Released on 2014-12-01
- Safari 9 Released on 2015-09-30
- Safari on iOS 9 Released on 2015-09-16
Specifications
- ECMAScript Language Specification (#sec-weakset-objects), from TC39 (Ecma International).