Brent Yorgey schrieb: > On Mon, May 23, 2011 at 10:49:55AM -0700, Alexander Solla wrote: >> There's a library function for it, but also: >> >>> filter ((/=) Nothing) >> is readable enough. > > Just a minor quibble: note that > >> filter (not . isNothing) > > is slightly preferable since it does not introduce a frivolous > equality constraint on the type wrapped by the Maybe.
Similar: http://www.haskell.org/haskellwiki/Haskell_programming_tips#Reduce_type_class_constraints http://www.haskell.org/haskellwiki/Haskell_programming_tips#Don.27t_ask_for_the_length_of_a_list_when_you_don.27t_need_it _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
