I think this is because there's no universal way of determining when an
iterator ends. The only way this could work for all iterators would require
popping values off of `a` after they've been added.

On Sat, Oct 1, 2016 at 6:17 AM, Cyril Auburtin <cyril.auburtin at gmail.com>
wrote:

> It was possibly already discussed, but why isn't:
> ```
> var [...a, last] = [1,2,3];
> ```
> supported?
>
> I don't see the problem, as long as there's one ... only
>
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>
>
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I think this is because there's no universal way of determining when an iterator ends (beforehand). The only way this could work for all iterators would require popping values off of `a` after they've been added.