Haskell Monads

class Monad m where

return :: a -> m a

(>>=) :: m a -> (a -> m b) -> m b

(>>) :: m a -> m b -> m b
x >> y = x >>= \_ -> y
fail :: String -> m a
fail msg = error msg
instance Monad Maybe where
return x = Just x
Nothing >>= f = Nothing
Just x >>= f = f x
fail _ = Nothing
  1. Identity Monad —
type I a = aunitI a = a 
a ‘bindI‘ k = k a
showI a = showval a
data E a = Success a | Error StringunitE a = Success a 
errorE s = Error s
(Success a) ‘bindE‘ k = k a
(Error s) ‘bindE‘ k = Error s
showE (Success a) = “Success: “ ++ showval a
showE (Error s) = “Error: “ ++ s

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