Haskell can solve the same problem that mixins solve, with typeclasses, much more elegantly. Because Haskell isn't object orientated, it is possible to simply n

Haskell can solve the same problem that mixins solve, with typeclasses, much more elegantly. Because Haskell isn't object orientated, it is possible to simply not import functions which are not desired, rather than running into namespace pollution problems. For example, suppose that RoundThings have a diameter, and it MovedThings have an offset from the original position. class RoundThing a where diameter :: a -> Double radius :: a -> Double radius a = diameter a / 2 circumference :: a -> Double circumference a = 2 * pi * (radius a) class MovedThing a where offset :: a -> Double class MovedRoundThing a where rotationsMoved :: (MovedThing a, RoundThing a) => a -> Double rotationsMoved a = offset a / circumference a data MovedBall = MovedBall Double Double instance RoundThing MovedBall where diameter (MovedBall dia _) = dia instance MovedThing MovedBall where offset (MovedBall _ offs) = offs instance MovedRoundThing MovedBall main = do let myBall = MovedBall 10 20 print (rotationsMoved myBall) I don't have to worry about, say, rotationsMoved polluting my namespaces, because if I don't want to import it, I don't have to.