I’ve also been guilty of:
if (xxx === void 0)
This is slightly better than saying “undefined”, since that’s not actually a
reserved word.
I believe that all of these should perform the same. We should pick one based
on what looks nicest and what has the most clear semantics.
-Filip
> On Nov 30, 2015, at 11:37 AM, Darin Adler <[email protected]> wrote:
>
> I see the following in some code:
>
> if (xxx === undefined)
>
> And I see the following in some other code:
>
> if (typeof xxx == “undefined”)
>
> or
>
> if (typeof xxx === “undefined”)
>
> Is one preferred over the other, style-wise? Is one more efficient than the
> other?
>
> — Darin
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