+++ /dev/null
-import "JavaBuiltin" as Java\r
-\r
-class Functor f where\r
- map :: (a -> b) -> f a -> f b\r
- \r
-data Foo a = Foo a\r
-\r
-instance Functor Foo where\r
- map f (Foo x) = Foo (f x)\r
- \r
-instance Functor Maybe where\r
- map f Nothing = Nothing\r
- map f (Just x) = Just (f x)\r
- \r
-data List a = Nil | Cons a (List a)\r
-\r
-instance Functor List where\r
- map f Nil = Nil\r
- map f (Cons h t) = Cons (f h) (map f t)\r
- \r
-main = map (map (Java.iadd 1)) (Cons Nothing (Cons (Just (1 :: Integer)) Nil))\r
---\r
-(Cons null (Cons 2 Nil))
\ No newline at end of file