Add the haskell book

1 files changed, 16 insertions, 0 deletions

diff --git a/Haskell-book/11/TooMany.hs b/Haskell-book/11/TooMany.hs
new file mode 100644
index 0000000..633c6b2
--- /dev/null
+++ b/Haskell-book/11/TooMany.hs
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+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE FlexibleInstances #-}
+module TooMany where
+
+newtype Goats = Goats Int deriving (Eq, Show, TooMany)
+
+newtype Cows = Cows Int deriving (Eq, Show)
+
+class TooMany a where
+    tooMany :: a -> Bool
+
+instance TooMany Int where
+    tooMany n = n > 42
+
+instance TooMany (Int, String) where
+    tooMany (n, _) = n > 42