Array comprehension syntax

[Yusuke Suzuki]

Related issues are here.

https://bugzilla.mozilla.org/show_bug.cgi?id=791343
https://bugzilla.mozilla.org/show_bug.cgi?id=791348
https://bugzilla.mozilla.org/show_bug.cgi?id=791352

Regards,
Yusuke Suzuki

On Sun, Sep 23, 2012 at 1:24 AM, Brendan Eich <brendan at mozilla.org> wrote:

> Jason Orendorff wrote:
>
>> I'm sorry for the confusion here.  I didn't mean to propose adding
>> for-each-in to ES6.  That would indeed be awful.  I just meant that
>> SpiderMonkey cannot necessarily drop this extension.  So if the ES6
>> syntax and SpiderMonkey's syntax can't coexist, it will be a problem
>> for us.
>>
>
> Not to bother es-discuss too much, but in case there's interest:
>
> I do hope we can retire 'each' from SpiderMonkey at some point. Supporting
> it in comprehensions has a cost. Your example:
>
>
>  [x for each(x in obj).y of z]
>
>
> can't be parsed without error given our current for-each implementation,
> and backtracking and restarting with 'each' not contextually meaningful
> sounds "fun".
>
> I don't expect a lot of SpiderMonkey- (and Rhino-) specific code will
> break, so making this an error when we support ES6 may be the best way.
> Pull the bandage off quickly!
>
> /be
>
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