Generische Instanzen (II)

class Show a where
    show ::  a -> String
instance Show a => Show [a] where
    show [] = "[]"
    show xs = brackets 
            $ concat
            $ intersperse "," 
            $ map show xs
show 1 = "1"
show [1,2,3] = "[1,2,3]"



Johannes Waldmann 2012-06-25