Haskell Language Monoid An instance of Monoid for ()
Example
() is a Monoid. Since there is only one value of type (), there's only one thing mempty and mappend could do:
instance Monoid () where
mempty = ()
() `mappend` () = ()
() is a Monoid. Since there is only one value of type (), there's only one thing mempty and mappend could do:
instance Monoid () where
mempty = ()
() `mappend` () = ()
