At 2010-10-03T22:45:30+02:00, Dominique Devriese wrote: > Additionally, you can't combine the functions (blowup . allButLast) > and lastToTheLength into a function that returns a pair like you seem > to attempt. You need a function like the following for that: > > comma :: (a -> b) -> (a -> c) -> a -> (b,c) > comma f g x = (f x, g x) > > Then you could say: > > blowup = (uncurry (++)) . comma (blowup . allButLast) lastToTheLength
Thanks, I'll try that. > Ignore this if you haven't read about Applicative or type classes yet, > but using the Applicative instance for arrow types (->) a, you can > also write > > comma = liftA2 (,) I hadn't come up to that point, but will read about it now. Regards, Raghavendra. -- N. Raghavendra <ra...@mri.ernet.in> | http://www.retrotexts.net/ Harish-Chandra Research Institute | http://www.mri.ernet.in/ See message headers for contact and OpenPGP information. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
