On Fri, Nov 9, 2012 at 9:35 AM, Mark S. Miller <[email protected]> wrote:
> > > > On Fri, Nov 9, 2012 at 9:01 AM, John J Barton <[email protected] > > wrote: > >> >> >> >> On Fri, Nov 9, 2012 at 4:33 AM, David Bruant <[email protected]> wrote: >> >>> Hi, >>> >>> In this message, I'll be sharing some experience I've had with the Q >>> library. I have worked with it for about 7-8 months in a medium/big Node.js >>> application (closed source, so I can't link, sorry). >>> I'll be covering only the parts that I have used during this experience. >>> It's related to my own writing style and I don't mean that the rest is >>> useless and should be thrown away, but the subset I'll be covering here has >>> proven to be sufficient to my needs for several months. >>> >>> I would be interested if others could share their experience if they had >>> a different way of using promises. >>> >> >> I also used Q (a slightly older version) for several months before >> removing it because of cost/benefit. >> > > I would like to understand this better. When you using only the > .then/.when callback style, or were you using the .send/.post style to send > eventual messages to the promised object? In my own code, I use mostly the > .send/.post style, and I find it substantially improves readability. > Only .then/.when. That is the style that many examples promote. I don't know about .send/.post. (Style is also important in callback based async coding, which is why the case against that approach is often over stated). > > See <https://docs.google.com/file/d/0Bw0VXJKBgYPMU1gzQ3hkY0Vrbmc/edit> > (with improved slides at < > http://code.google.com/p/es-lab/downloads/detail?name=friam.pdf#makechanges>) > for a particularly elegant example using promises. I would be curious how > well you could express this without promises. > I also encountered a couple of cases where promises work exceptionally well. If promises were built into the language and debuggers were upgraded, then I would choose to use them for just these cases. Given both preconditions I'm unsure I would use promises more broadly: they are not the panacea I imagined when reading examples written by advocates. I would strongly advocate realistic evaluation of a debugging system for promises (like eg Causeway) before committing to implementing them in the language. jjb
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