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/semigroup/src/Bool.hs | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Haskell-book/15/semigroup/src/Bool.hs (limited to 'Haskell-book/15/semigroup/src/Bool.hs') diff --git a/Haskell-book/15/semigroup/src/Bool.hs b/Haskell-book/15/semigroup/src/Bool.hs new file mode 100644 index 0000000..2efdd34 --- /dev/null +++ b/Haskell-book/15/semigroup/src/Bool.hs @@ -0,0 +1,30 @@ +module Bool where + +import Data.Semigroup +import Test.QuickCheck + +newtype BoolConj = BoolConj Bool deriving (Eq, Show) + +instance Semigroup BoolConj where + (BoolConj True) <> (BoolConj True) = BoolConj True + _ <> _ = BoolConj False + +instance Monoid BoolConj where + mempty = BoolConj True + mappend = (<>) + +instance Arbitrary BoolConj where + arbitrary = fmap BoolConj arbitrary + +newtype BoolDisj = BoolDisj Bool deriving (Eq, Show) + +instance Semigroup BoolDisj where + (BoolDisj False) <> (BoolDisj False) = BoolDisj False + _ <> _ = BoolDisj True + +instance Monoid BoolDisj where + mempty = BoolDisj False + mappend = (<>) + +instance Arbitrary BoolDisj where + arbitrary = fmap BoolDisj arbitrary -- cgit v1.2.3