with

David Herman dherman at mozilla.com
Wed Nov 16 23:30:43 PST 2011


<|

On Nov 16, 2011, at 11:27 PM, Mark S. Miller wrote:

> 
> 
> On Wed, Nov 16, 2011 at 11:24 PM, David Herman <dherman at mozilla.com> wrote:
> Someone who shall remain nameless shot this down when I floated it privately. But I just have to throw this out there, because I kind of can't stop myself falling in love with it...
> 
> We used to have this (mis-)feature for dynamically extending scope chains, and despite being ill-conceived, it did have this elegant syntax spelled "with." In ES5 strict, we banned that feature, and it's not coming back for ES6, or ever.
> 
> Now we want a (good) feature for dynamically extending prototype chains. And here's this old keyword, just lying around unused...
> 
>    obj with { foo: 12 } with { bar: 13 } with { baz: 17 }
> 
> I don't get it yet. What do you mean by "dynamically extending prototype chains"? What does the above expression do and evaluate to?
> 
>  
> 
> So? Who's with me?
> 
> Dave
> 
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> 
> 
> 
> -- 
>     Cheers,
>     --MarkM

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