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Within LTS Haskell 24.40 (ghc-9.10.3)

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1. mapExcept :: (Either e a -> Either e' b) -> Except e a -> Except e' b

   rebase	Rebase.Prelude

   Map the unwrapped computation using the given function.

   • runExcept (mapExcept f m) = f (runExcept
     m)

2. mapExceptT :: (m (Either e a) -> n (Either e' b)) -> ExceptT e m a -> ExceptT e' n b

   rebase	Rebase.Prelude

   Map the unwrapped computation using the given function.

   • runExceptT (mapExceptT f m) = f
     (runExceptT m)

3. mapMaybeT :: (m (Maybe a) -> n (Maybe b)) -> MaybeT m a -> MaybeT n b

   rebase	Rebase.Prelude

   Transform the computation inside a MaybeT.

   • runMaybeT (mapMaybeT f m) = f (runMaybeT
     m)

4. mapReader :: (a -> b) -> Reader r a -> Reader r b

   rebase	Rebase.Prelude

   Transform the value returned by a Reader.

   • runReader (mapReader f m) = f .
     runReader m

5. mapReaderT :: (m a -> n b) -> ReaderT r m a -> ReaderT r n b

   rebase	Rebase.Prelude

   Transform the computation inside a ReaderT.

   • runReaderT (mapReaderT f m) = f .
     runReaderT m

6. mapState :: ((a, s) -> (b, s)) -> State s a -> State s b

   rebase	Rebase.Prelude

   Map both the return value and final state of a computation using the given function.

   • runState (mapState f m) = f . runState
     m

7. mapStateT :: (m (a, s) -> n (b, s)) -> StateT s m a -> StateT s n b

   rebase	Rebase.Prelude

   Map both the return value and final state of a computation using the given function.

   • runStateT (mapStateT f m) = f .
     runStateT m

8. mapWriter :: ((a, w) -> (b, w')) -> Writer w a -> Writer w' b

   rebase	Rebase.Prelude

   Map both the return value and output of a computation using the given function.

   • runWriter (mapWriter f m) = f (runWriter
     m)

9. mapWriterT :: (m (a, w) -> n (b, w')) -> WriterT w m a -> WriterT w' n b

   rebase	Rebase.Prelude

   Map both the return value and output of a computation using the given function.

   • runWriterT (mapWriterT f m) = f
     (runWriterT m)

10. mappend :: Monoid a => a -> a -> a

    rebase	Rebase.Prelude

    An associative operation NOTE: This method is redundant and has the default implementation mappend = (<>) since base-4.11.0.0. Should it be implemented manually, since mappend is a synonym for (<>), it is expected that the two functions are defined the same way. In a future GHC release mappend will be removed from Monoid.

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