On Fri, Oct 21, 2011 at 10:20 AM, John J Barton <johnjbar...@johnjbarton.com > wrote:
> > > On Fri, Oct 21, 2011 at 9:41 AM, Brendan Eich <bren...@mozilla.com> wrote: > >> On Oct 21, 2011, at 9:34 AM, John J Barton wrote: >> >> Can anyone summarize how these proposals relate to Kris Kowal / Kris Zyp / >> Mark Miller Q library: >> https://github.com/kriskowal/q >> >> >> In the credit where due dept., the original Q library is Tyler Close's ref_send library. Other related and prior work is linked to at http://wiki.ecmascript.org/doku.php?id=strawman:concurrency#see > Did you see >> https://github.com/kriskowal/q/tree/master/examples/async-generators yet? >> > > Thanks, I think that page clarifies my issue with generators: they solve a > problem I don't have. > In that case, you might be equally uninterested ;) in http://wiki.ecmascript.org/doku.php?id=strawman:async_functions#reference_implementation which shows how to do the same thing with generators as proposed for ES-next. > See below. > > >> >> >> In my experience, reasoning about the code was much easier with Q than >> without Q. (Not something I found in trying generators). >> >> >> In order to say something that isn't subjective yet content-free other >> than negative, what was hard to reason about, and why? Can you give three >> examples? >> > > I only mentioned generators since Zyp's proposal uses yield. Now I'm > regretting it because I really wanted to highlight Q. > > My comment is entirely subjective and intended to be positive about Q. > Thanks! I am positive about Q as well. And yes, I like Kris Kowal's implementation. > > The examples on the async-generators page cites above are clearer than the > ones on the MDC generators page because they focus on "next()". The strong > case for generators is support for generic, encapsulated iteration. Examples > illustrating this power would go a long way to build the case for them IMO. > Examples of quirky iteration do not. > > Now back to Zyp's key point: using async functionality for iteration, > powerful or not, does not address the key use-case for async. > > In particular, Q simplifies joining parallel async operations (XHR, > postMessages, 'load', 'progress' events). Of course it may well be that > generators provide an elegant solution to this important problem, but I've > not seen such examples. > Have you seen http://wiki.ecmascript.org/doku.php?id=strawman:concurrency#q.race and http://wiki.ecmascript.org/doku.php?id=strawman:concurrency#q.all ? If these don't address the joining you have in mind, could you post some examples? Thanks. > > > jjb > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > -- Cheers, --MarkM
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