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Within LTS Haskell 24.40 (ghc-9.10.3)

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

   mtl-prelude	MTLPrelude

   Map the unwrapped computation using the given function.

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

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

   mtl-prelude	MTLPrelude

   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)

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

   mtl-prelude	MTLPrelude

   Map the inner computation using the given function.

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

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

   mtl-prelude	MTLPrelude

   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

   mtl-prelude	MTLPrelude

   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

   mtl-prelude	MTLPrelude

   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

   mtl-prelude	MTLPrelude

   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

   mtl-prelude	MTLPrelude

   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

   mtl-prelude	MTLPrelude

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

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

10. mapParseError :: Ord e' => (e -> e') -> ParseError s e -> ParseError s e'

    network-uri-template	Network.URI.Template.Internal.Parse

    Modify the custom data component in a parse error. This could be done via fmap if not for the Ord constraint.

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