Haskell Class

A method to assign Haskell Typeclass to a collection of virtual methods.

class myClass a where
	myclass :: a -> Bool

Defining Own Typeclass

class YesNo a where
	yesno :: a -> Bool
	negate :: a -> Bool
	negate x = not (yesno x)
 
-- all children (instances)	inherit the methods from class
instance YesNo Integer where
	yesno 0 = False
	yesno _ = True
 
instance YesNo [a] where
	yesno [] = False
	yesno _ = True

Examples

• Haskell Eq