Not quite impossible, you just have to get a bit creative. While certainly
not as fast as a built in implementation, the method used here is still
O(1). https://github.com/Benvie/ES6-Harmony-Collections-Shim
> The major use case for Maps and Sets (as far as i'm concerned) is the
> ability to use objects as keys. Having built-in implementation of these
> potentially enable O(1)-ish lookups (which is impossible to implement in
> JavaScript).
> As to Maps and {} being equivalent, that's true expect when it's not, like
> when you want to use pseudo properties like __proto__ or __noSuchMethod__
> as keys. Some folks tried to use objects as maps and got burned [1]. See
> Caja's StringMap [2] for a workaround when you only need strings as keys.
>
>
>
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