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/15/orphan-instance/Listy.hs | 10 ++++++++++ Haskell-book/15/orphan-instance/ListyInstances.hs | 9 +++++++++ 2 files changed, 19 insertions(+) create mode 100644 Haskell-book/15/orphan-instance/Listy.hs create mode 100644 Haskell-book/15/orphan-instance/ListyInstances.hs (limited to 'Haskell-book/15/orphan-instance') diff --git a/Haskell-book/15/orphan-instance/Listy.hs b/Haskell-book/15/orphan-instance/Listy.hs new file mode 100644 index 0000000..c99720a --- /dev/null +++ b/Haskell-book/15/orphan-instance/Listy.hs @@ -0,0 +1,10 @@ +module Listy where + +newtype Listy a = + Listy [a] + deriving (Eq, Show) + +instance Monoid (Listy a) where + mempty = Listy [] + mappend (Listy l) (Listy l') = + Listy $ mappend l l' diff --git a/Haskell-book/15/orphan-instance/ListyInstances.hs b/Haskell-book/15/orphan-instance/ListyInstances.hs new file mode 100644 index 0000000..39f7210 --- /dev/null +++ b/Haskell-book/15/orphan-instance/ListyInstances.hs @@ -0,0 +1,9 @@ +module ListyInstances where + +import Data.Monoid +import Listy + +instance Monoid (Listy a) where + mempty = Listy [] + mappend (Listy l) (Listy l') = + Listy $ mappend l l' -- cgit v1.2.3