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

   mtl	Control.Monad.Except

   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

   mtl	Control.Monad.Except

   Map the unwrapped computation using the given function.

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

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

   mtl	Control.Monad.RWS.CPS

   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 :: (Monad n, Monoid w, Monoid w') => (m (a, s, w) -> n (b, s, w')) -> RWST r w s m a -> RWST r w' s n b

   mtl	Control.Monad.RWS.CPS

   Map the inner computation using the given function.

   • runRWST (mapRWST f m) r s = f (runRWST m r s) mapRWST :: (m (a, s, w) -> n (b, s, w')) -> RWST r w s m a -> RWST r w' s n b

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

   mtl	Control.Monad.RWS.Lazy

   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)

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

   mtl	Control.Monad.RWS.Lazy

   Map the inner computation using the given function.

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

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

   mtl	Control.Monad.RWS.Strict

   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)

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

   mtl	Control.Monad.RWS.Strict

   Map the inner computation using the given function.

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

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

   mtl	Control.Monad.Reader

   Transform the value returned by a Reader.

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

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

    mtl	Control.Monad.Reader

    Transform the computation inside a ReaderT.

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

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