On Nov 17, 2011, at 1:30 PM, Brendan Eich wrote:
> If I have code of the kind Mike Samuel showed:
>
> obj
> with ({ foo: 12 })
> {}
>
> and I migrate directly into ES-whatever with 'with' as you propose (instead
> of <|), then I do not get an early error.
Understood.
>>> Also, using 'with' around object literals makes me want functional record
>>> update. IIRC we've talked about that before.
>>
>> That's one of the things I like about `with` for this: prototype extension
>> is already a great mechanism for functional update on objects.
>
> Prototype extension or delegation is not the same as FRU at all -- the
> delegating object can shadow proto-properties,
That's precisely what makes it analogous to FRU. You functionally update (i.e.,
update without mutating) by shadowing.
> the chaining is observable many ways (methods on the prototype, not only
> reflection APIs), there are two objects not one.
Yes it's observable, but it's a very natural fit. It's how I do FRU today,
using Object.create.
Dave
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