WeakMap

A WeakMap object holds key-value pairs that do not create strong references to its keys, such that value data can be associated with a key without preventing garbage collection of the key.

Baseline Status: Achieved Widely Available on Jan 29, 2018 (Cross-browser Newly Available since Jul 29, 2015).

Desktop Browser Engine Support

Google Chrome

36

Supported

Mozilla Firefox

6

Supported

Apple Safari

8

Supported

Microsoft Edge

12

Supported

Mobile Browser Engine Support

Chrome Android

36

Firefox Android

6

Safari iOS

8

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

javascript.builtins.WeakMap ↗ javascript.builtins.WeakMap.WeakMap ↗ javascript.builtins.WeakMap.WeakMap.iterable_allowed ↗ javascript.builtins.WeakMap.WeakMap.null_allowed ↗ javascript.builtins.WeakMap.delete ↗ javascript.builtins.WeakMap.get ↗ javascript.builtins.WeakMap.has ↗ javascript.builtins.WeakMap.set ↗ javascript.builtins.WeakMap.symbol_as_keys ↗