>
>
> * As far as I can tell, `hasOwnProperty` is mainly used to implement maps
> via objects. `Map` will eliminate this use case.
>
To a certain extent yes, but not completely. Objects-as-maps will still be
used quite frequently as object literals passed into functions (as an
options object, for example).
I think that there is still a need here. Since we are really interested in
*keys*, what about this:
Object.hasKey(obj, someKey);
which would be a more ergonomic and efficient way of saying:
Object.keys(obj).some(key => key === someKey)
?
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