Just noting that with the infix ! syntax proposed for ES7, this would be
e.respondWith(cache.get('foo') ! [0])
On Wed, Feb 5, 2014 at 4:44 PM, Tab Atkins Jr. <[email protected]> wrote:
> On Wed, Feb 5, 2014 at 3:51 PM, Brendan Eich <[email protected]> wrote:
> > Tab Atkins Jr. wrote:
> >> But say you wanted to do something a bit more complicated. For
> >> example, if the cache hits, but the result is a Promise, you might
> >> want to show a throbber until the Promise resolves. Under the old
> >> consensus, you could do this pretty easily - just do
> >> "cache.get().chain(...)" and then operate on the result. Under the
> >> new, you can't, because the cache promise won't resolve until after
> >> the response promise resolves. We can't say "just hand-box", because
> >> it breaks the easy pattern above when you*don't* want to do anything
> >>
> >> complicated - you have to .then() it and unbox there.
> >
> > Yeah, that would suck for the pretty one-liner. But is it really that
> much
> > more? Write it out and let's see A vs. B.
>
> e.respondWith(cache.get('foo').then(x=>x[0]))
>
> ...which doesn't look like much until you realize you have to repeat
> the invocation on every single cache retrieval. (And remember to box
> with [] on every cache set, or else the retrieval will error out.)
>
> ~TJ
>
--
Cheers,
--MarkM
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