[Haskell-cafe] Re: I hate Haskell's typeclasses

Jonathan Cast wrote:

Type case is easy:

genericShow :: Typeable a => a -> String genericShow x = fromJust $ do s <- cast x :: Maybe String return s `mplus` do n <- cast x :: Maybe Int return (show n) `mplus` do return "<unknown>"

This is a nice idiom I didn't know before. Definitely worth page on the wiki or two. Cheers Ben