WeakMapA 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.collectionsCollectionswidely2015-07-292018-01-29https://tc39.es/ecma262/multipage/keyed-collections.html#sec-weakmap-objectshttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakMapjavascript.builtins.WeakMapjavascript.builtins.WeakMap.WeakMapjavascript.builtins.WeakMap.WeakMap.iterable_allowedjavascript.builtins.WeakMap.WeakMap.null_allowedjavascript.builtins.WeakMap.deletejavascript.builtins.WeakMap.getjavascript.builtins.WeakMap.hasjavascript.builtins.WeakMap.setjavascript.builtins.WeakMap.symbol_as_keyshttps://nowyoucanuse.com/features--weakmap.html