inline Am Mittwoch, 16. April 2014 08:46:48 UTC+2 schrieb willem dhaeseleer: > > > Andrew, > > For the love of all that is dear to us, Use promises, do not support > callbacks, don't even think about supporting both. > There is a reason why promises are becoming part of the standard in ECMA 6. >
they are there to give you an alternative, not a replacement. Callbacks are simple for simpler things. they are the core pattern and they are accepted. every single person new to node, can just use them, as soon she understood async coding style. it is a very bad habbit to only provide promises api. one of the top3 popular modules on npm is async, which handles callbacks. So, stop crying about callbacks, learn them and provide a cb-based interface. and stop saying us. :P > > Here are a few of many reasons why to choose promises: > > - It prevent deep indentation > flatten your code. > - It always you to pass on asynchronous operations > huh? > - Asyncronous callstacks and consistent error handling ( you want this ) > - How many types have you typed *if (err) throw err *or *if (err) > console.warn(err) ?* > you actually type this yourself? > - Refactoring in callback styled code is extremely tedious to the point > where it would be almost reasonable to say it's impossible > it always hard to refactor bad written code either with callbacks, promises or even synchronous code. > - Improved readability trough more logical control flow > duh. readability is subjective. > - Integration with coroutines ( you want this ) > huh? how is that connected? > > > > On Tuesday, April 15, 2014 6:20:05 AM UTC+2, Andrew de Andrade wrote: >> >> So at work we're working on a bunch of node modules that will eventually >> be published as open-source and I'm in favor of callbacks and two of my >> co-workers are in favor of promises. We've discussed supporting both API >> interfaces and I was curious what the general consensus of the community >> was with respect to supporting both and the best way to name functions and >> methods to support both. >> >> That being said, there are three obvious choices: >> >> (a) two function types: (1) synchronous functions; and (2) async >> functions that return promises but also handle callbacks >> >> var value = myFunctionSync(); >> myFunction(callback); >> var promise = myFunction(); >> >> this approach has a tiny performance overhead (since you have to check if >> the last argument is a function to determine if you should return a promise >> or execute that function as the callback) and makes all the functions a >> little convoluted (unless you make one higher order function that you apply >> to all your callback functions to support both APIs). Furthermore async, >> higher order, overloaded functions or variable arity functions become >> impossible since you can't necessarily assume that the last argument is >> always the callback. >> >> (b) three function types: (1) synchronous functions; (2) async callback >> functions; and (3) async promise functions >> >> var value = myFunctionSync(); >> myFunction(callback); >> var promise = myFunctionDeferred(); >> >> this is ugly but explicit in terms of what to expect and permits the most >> flexibility. >> >> (c) two function types: (1) synchronous functions; (2) async callback >> functions; >> >> var value = myFunctionSync(); >> myFunction(callback); >> >> and promise support is left up to the user by using a nodeify() method >> from a promise library. This is my preference, but won't make my co-workers >> happy. >> >> >> With all this in mind, what's the general consensus of the NodeJS >> community on this issue? I searched google and the archives and could not >> find any blog posts or discussions that address this particular issue. What >> are the pros and cons of each approach? What if any libraries implement >> options (a) or (b)? etc. >> >> >> -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
