Rest parameter syntax

[Russell Leggett]

On Tue, Jun 12, 2012 at 11:26 AM, Rick Waldron <waldron.rick at gmail.com>wrote:

>
>
> On Tue, Jun 12, 2012 at 10:38 AM, Felix Böhm <esdiscuss at feedic.com> wrote:
>
>> Per definition, rest parameters always need to be at the end of a
>> FormalParameterList. I was wondering if this limitation could be liftet.
>>
>
>  Consider:
>
>
> function foo( a, b, ...others, c ) {
>   return [ a, b, others, c ];
> }
>
>
> foo( 1, 2, 3, 4, 5, 6, 7, 8, 9 );
>
>
>   a  b  others
> [ 1, 2, [ 3, 4, 5, 6, 7, 8, 9 ] ]
>
>
> How do you resolve where to stop claiming arguments as items in the rest
> param "others"?
>

Well, I mean, technically speaking its no different than a very simple
regex.

> /(.)(.)(.*)(.)/.exec("123456789");
["123456789", "1", "2", "345678", "9"]

> /(.)(.)(.*)(.)/.exec("123");
["123", "1", "2", "", "3"]

>From that perspective, it seems pretty deterministic and easy to explain.
There's probably a reason I'm not thinking of, though.

- Russ


Rick
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