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1. mapCont :: (r -> r) -> Cont r a -> Cont r a

   monads-tf	Control.Monad.Cont

   Apply a function to transform the result of a continuation-passing computation.

   • runCont (mapCont f m) = f . runCont
     m

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

   monads-tf	Control.Monad.Except

   Map the unwrapped computation using the given function.

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

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

   monads-tf	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)

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

   monads-tf	Control.Monad.RWS.Lazy

   Map the inner computation using the given function.

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

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

   monads-tf	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)

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

   monads-tf	Control.Monad.RWS.Strict

   Map the inner computation using the given function.

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

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

   monads-tf	Control.Monad.Reader

   Transform the value returned by a Reader.

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

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

   monads-tf	Control.Monad.Reader

   Transform the computation inside a ReaderT.

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

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

   monads-tf	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

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

    monads-tf	Control.Monad.State.Lazy

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

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

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