In Ruby ...? is used for methods returning boolean. E.g. 5.even?. Boolean variables are not sufficed. E.g. x = 5.even? The method call "even?" is the question. "x" is the answer.
On 25. April 2017 04:43:23 GMT+00:00, Alex Vong <[email protected]> wrote: >Good question! I can't decide as well. I want to know how people think >about it. > >In a lazy language, a variable is a 0-ary thunk, while a predicate is a >1-ary thunk. Since they are really just special case of a general >thing, >it make sense to use foo? for both cases. But we all know guile is not >lazy, so I really don't know what to do. > >Christopher Allan Webber <[email protected]> writes: > >> Hello everyone! Here's a little bikeshed for us to paint. >> >> I've noticed that it's common in Guile modules to use "foo?" for >> variable names involving booleans. It's tempting, because this looks >> an awful lot like you're asking a question... and it's also common >> for this even to be keyword arguments to procedures, etc. >> >> But is it a good idea? I thought "foo?" was supposed to be for >> predicates, as a nicer version of the "foo-p" predicate convention in >> other non-scheme lisps. I can't imagine other lisps doing "foo-p" >for >> just variables with boolean values. >> >> On the other hand, once you start adding ? to the end of boolean'y >> things, it *does* become tempting to put them at the end of boolean >> variables and arguments. It looks pretty nice. >> >> What do people think? I'm struggling with deciding what's the right >> thing for my own code, but leaning towards "we shouldn't use the ? >> suffix for just boolean values". >> >> - Chris -- Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet.
