> Are you recommending only using function(err, value) pattern for async operations?
Yes. Think of Callback as a type `Callback<T>: (err: Error, value: Value) => void` It has very specific semantics. it takes two arguments, err is either an Error or falsey, value is anything. A callback get's called EXACTLY once. > general a callback is an instance of the Observer pattern ಠ_ಠ <http://disapprovalface.com/> On Fri, Apr 12, 2013 at 8:10 AM, greelgorke <greelgo...@gmail.com> wrote: > the term "Callback" in node is very bound to "function will be called > after async call is done". In general a callback is an instance of the > Observer pattern, which is in fact a variant of the Delegate pattern. and > the function you pass to the forEach is in fact a Delegate or you could > call it Strategy pattern. the difference is in the semantics. > > So in node context, callbacks are things called by async functions. bei > forEach its a delegate, be map it's a transform functions, bei filter, it's > filter rule etc. > > Am Freitag, 12. April 2013 12:21:45 UTC+2 schrieb Tim Oxley: > >> >> >> On Tuesday, 9 April 2013 23:56:44 UTC-4, Raynos wrote: >>> >>> @Eldar, that's an iterator function not a callback. A callback is very >>> specifically a function (err, value) {} that will not be called >>> synchronously. >>> >>> >> I've never heard a callback being "very specifically not synchronous"? >> Are you recommending only using function(err, value) pattern for async >> operations? >> > -- > -- > 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 nodejs@googlegroups.com > To unsubscribe from this group, send email to > nodejs+unsubscr...@googlegroups.com > 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 nodejs+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- 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 nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com 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 nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
