Created
August 11, 2011 18:11
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Functor, Applicative Functor, Monad typeclasses in Haskell and their (simplistic) Scala translation
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trait Functor[T[_]]{ | |
def fmap[A,B](f:A=>B)(ta:T[A]):T[B] | |
} | |
trait Applicative[T[_]] extends Functor[T]{ | |
def pure[A](a:A):T[A] | |
def <*>[A,B](tf:T[A=>B])(ta:T[A]):T[B] | |
} | |
trait Monad[M[_]] extends Applicative[M]{ | |
def >>=[A,B](ma:M[A])(f:A=>M[B]):M[B] | |
} |
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-- from "Learn you a Haskell for great good" | |
class Functor f where | |
fmap :: (a -> b) -> f a -> f b | |
class (Functor f) => Applicative f where | |
pure :: a -> f a | |
(<*>) :: f (a -> b) -> f a -> f b | |
class (Applicative m) = > Monad m where | |
(>>=) :: m a -> (a -> m b) -> m b |
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