Maybe ban holes, then... (was: Re: lexical for-in/for-of loose end)

[Herby Vojčík]

Allen Wirfs-Brock wrote:
> That said, I'd hate to see things like:
>
> [,,,,,x] = someArray;
>
> and even
> [a,,y] = someArray;
>
> can be easily missed.
>
> It isn't clear to me that we are doing ES programmers (especially those
> with poor eyesight) a favor by allowing such expressions. What is the
> evidence with JS1.7 up. How much usage do we see of such holes?

If

   {"5":x} = someArray;

and

   {"0":a, "2":y} = someArray;

would be possible, there is probably little need for holes. In case of

   [a,b,c,d,,f] = someArray;

one could always use (some conventional) anon-var, like _ (from Prolog):

   [a,b,c,d,_,f] = someArray;

Herby