Return the keys in a weak map. This operation is
non-deterministic because it is affected by the scheduling of the
garbage collector and the cycle collector.
Returns
If aMap is a weak map object, return the keys of the weak
map as an array. Otherwise, return undefined.
Return the keys in a weak map. This operation is non-deterministic because it is affected by the scheduling of the garbage collector and the cycle collector.
Returns
If aMap is a weak map object, return the keys of the weak map as an array. Otherwise, return undefined.