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-rw-r--r-- | applicative/h1.hs | 14 | ||||
-rw-r--r-- | applicative/h2.hs | 10 |
2 files changed, 24 insertions, 0 deletions
diff --git a/applicative/h1.hs b/applicative/h1.hs new file mode 100644 index 0000000..b13c33d --- /dev/null +++ b/applicative/h1.hs @@ -0,0 +1,14 @@ +import Control.Applicative + +data MyMaybe a = MyNothing | MyJust a + deriving (Show) + +instance Functor MyMaybe where + fmap _ MyNothing = MyNothing + fmap f (MyJust x) = MyJust (f x) + +instance Applicative MyMaybe where + pure x = MyJust x + MyNothing <*> _ = MyNothing + _ <*> MyNothing = MyNothing + (MyJust f) <*> (MyJust g) = MyJust (f g) diff --git a/applicative/h2.hs b/applicative/h2.hs new file mode 100644 index 0000000..6d9b801 --- /dev/null +++ b/applicative/h2.hs @@ -0,0 +1,10 @@ +import Control.Applicative + +newtype MyZipList a = MyZipList { getMyZipList :: [a] } + +instance Functor MyZipList where + fmap f (MyZipList x) = MyZipList (fmap f x) + +instance Applicative MyZipList where + pure x = MyZipList [x] + (MyZipList gs) <*> (MyZipList xs) = MyZipList (zipWith ($) gs xs) |