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1. 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)

2. 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)

3. 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

4. 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)

5. 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)

6. 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)

7. 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)

8. 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

9. 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

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

    mtl	Control.Monad.State.Lazy

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

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

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