Quasis: assignable substitutions?

Axel Rauschmayer axel at rauschma.de
Fri Jun 17 12:46:37 PDT 2011


Syntax error (in some cases)?

On Jun 17, 2011, at 21:38 , Mark S. Miller wrote:

> 
> 
> On Fri, Jun 17, 2011 at 12:18 PM, Mike Samuel <mikesamuel at gmail.com> wrote:
> 2011/6/17 Axel Rauschmayer <axel at rauschma.de>:
> > and redefines the SVE of ${=x.y} to be
> >
> >     function () { return arguments.length ? (x.y = arguments[0]) : x.y }
> >
> > so instead of passing substitution values, for read-only substitutions
> >
> > (those without the = modifier) you get a thunk, and for writable
> >
> > substitutions you get a function that returns the value when called
> >
> > with 0 arguments or assigns the first parameter if passed one.
> >
> > It also allows for multiple evaluation of substitutions which might be
> > useful for looping constructs in the template use-case.
> >
> > Yes, useful. I assume that if the expression is not assignable, trying to
> > use the function as a setter will produce an exception(?)
> 
> That's a good point.  It should but does not currently.
> 
> A failed strict assignment throws, and therefore a failed ES-next assignment does. So are you sure it does not currently throw? From your expansion, I'd expect it does.
> 
>  
> 
> > --
> > Dr. Axel Rauschmayer
> > axel at rauschma.de
> > twitter.com/rauschma
> > home: rauschma.de
> > blog: 2ality.com
> >
> >
> >
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> 
> 
> 
> -- 
>     Cheers,
>     --MarkM

-- 
Dr. Axel Rauschmayer
axel at rauschma.de
twitter.com/rauschma

Home: rauschma.de
Blog: 2ality.com

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