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Within LTS Haskell 24.33 (ghc-9.10.3)

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1. mappendS :: forall w (m :: Type -> Type) . (Monoid w, Monad m) => Automaton m w w

   automaton	Data.Automaton

   Like mappendFrom, initialised at mempty.

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

   automaton	Data.Automaton.Trans.Maybe

   Transform the computation inside a MaybeT.

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

3. mapRWS :: ((a, s, w) -> (b, s, w')) -> RWS r w s a -> RWS r w' s b

   automaton	Data.Automaton.Trans.RWS

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

   • runRWS (mapRWS f m) r s = f (runRWS m r
     s)

4. mapRWST :: (m (a, s, w) -> n (b, s, w')) -> RWST r w s m a -> RWST r w' s n b

   automaton	Data.Automaton.Trans.RWS

   Map the inner computation using the given function.

   • runRWST (mapRWST f m) r s = f (runRWST m
     r s)

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

   automaton	Data.Automaton.Trans.Writer

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

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

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

   automaton	Data.Automaton.Trans.Writer

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

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

7. mapOutput :: forall (m :: Type -> Type) a b e . Functor m => (a -> b) -> StreamExcept a m e -> StreamExcept b m e

   automaton	Data.Stream.Except

   Apply a function to the output of the stream

8. mapOptimizedStreamT :: (Functor m, Functor n) => (forall s . () => m (Result s a) -> n (Result s b)) -> OptimizedStreamT m a -> OptimizedStreamT n b

   automaton	Data.Stream.Optimized

   Change the output type and effect of a stream without changing its state type.

9. mapResultState :: (s1 -> s2) -> Result s1 a -> Result s2 a

   automaton	Data.Stream.Result

   Apply a function to the state of a Result.

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

    base-prelude	BasePrelude

    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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