Hello Ross, Tuesday, October 31, 2006, 11:59:56 AM, you wrote:
splitEithers (the Either counterpart of catMaybes) is a great idea. (Except maybe for the name; all these split's are getting confusing.) See also mapEither (the counterpart of mapMaybe) in Data.Map.
I'm not so keen on isLeft, isRight, fromLeft and fromRight. Pattern matching is clearer and safer: at the point you make the decision, the type system has the extra information about the branch you've chosen. It also pushes the programmer to put the decision and the use of the data together, another good thing. The isJust/fromJust combination is already a rich source of bugs; we don't need more. (Same goes for null/head/tail, of course.)
nevertheless, we want to use them all :) "don't teach me a life, just give some money :)" -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com