3 files changed, 15 insertions, 0 deletions
diff --git a/functor/h1.hs b/functor/h1.hs
new file mode 100644
index 0000000..11688ad
--- /dev/null
+++ b/functor/h1.hs
@@ -0,0 +1,7 @@
+data MyEither a b = MyLeft a | MyRight b
+    deriving (Show)
+
+instance Functor (MyEither a) where
+    fmap f (MyLeft a) = MyLeft a
+    fmap f (MyRight b) = MyRight (f b)
+
diff --git a/functor/h2.hs b/functor/h2.hs
new file mode 100644
index 0000000..54be77c
--- /dev/null
+++ b/functor/h2.hs
@@ -0,0 +1,2 @@
+instance Functor ((->) e) where
+    fmap = (.)
diff --git a/functor/h3.hs b/functor/h3.hs
new file mode 100644
index 0000000..1a048f6
--- /dev/null
+++ b/functor/h3.hs
@@ -0,0 +1,6 @@
+data ITree a = 
+    Leaf (Int -> a) | Node [ITree a]
+
+instance Functor ITree where
+    fmap f (Node x) = Node (fmap (fmap f) x)
+    fmap f (Leaf x) = Leaf (f.x)