2007/8/15, Aaron Denney <[EMAIL PROTECTED]>: > > > > The original "last" fail on empty list, it's far easier to obtain the > > same semantic with foldl than with foldr, in fact it isn't hard at all > > to make it polymorphic without hassle (contrary to the foldr case) > > _if_ you remember that there _is_ a value in Haskell wich belongs to > > every type. > > Hah. True. That does simplify things considerably. Still, I'd call > that an infelicity in last (and head, for that matter), and would rather > have such errors handled at the call site than making the entire program > fall over.
Control.Exception.catch (evaluate $ myLast []) print (in GHC it works) Still I don't see why foldl would make it harder to use Maybe than foldr (in fact it's easier). -- Jedaï _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
