Re: [Haskell-beginners] a problem with maps

Dennis Raddle wrote:

mapOutList :: Ord k => [(k,a)] -> Mpa k [a] mapOutList list = M.fromList $ map (second (: [])) list

I'm not sure that this really does what you want. Rather something like this: fromAmbList :: Ord k => [(k, a)] -> Map k [a] fromAmbList = M.fromListWith (++) . map (second pure) Greets, Ertugrul -- nightmare = unsafePerformIO (getWrongWife >>= sex) http://ertes.de/