From 98329e0a3dd4f78b5d815ac3896272ec70904901 Mon Sep 17 00:00:00 2001 From: Eugen Wissner Date: Thu, 11 Dec 2025 10:28:11 +0100 Subject: Add remaining haskell book exercises --- Haskell-book/17/Identity.hs | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 Haskell-book/17/Identity.hs (limited to 'Haskell-book/17/Identity.hs') diff --git a/Haskell-book/17/Identity.hs b/Haskell-book/17/Identity.hs new file mode 100644 index 0000000..6b5f9a9 --- /dev/null +++ b/Haskell-book/17/Identity.hs @@ -0,0 +1,9 @@ +newtype Identity a = Identity a + deriving (Eq, Show, Ord) + +instance Functor Identity where + fmap f (Identity x) = Identity $ f x + +instance Applicative Identity where + pure x = Identity x + (Identity f) <*> (Identity y) = Identity $ f y -- cgit v1.2.3