On Mon, 2009-01-12 at 21:48 +0000, Robin Green wrote: > > > convert b = unfoldr (\n -> if n > 0 then Just (n `mod` b, n `div` > > > b) else Nothing) > > > > I have the nice function 'toMaybe' which simplifies this to: > > unfoldr (\n -> toMaybe (n>0) (n `mod` b, n `div` b)) > > I would use the more general idiom: > > unfoldr (\n -> guard (n > 0) >> return (n `mod` b, n `div` b))
I have the equivalent in my ‘useful functions’: > ifM p x = if p then return x else mzero
signature.asc
Description: This is a digitally signed message part
_______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
