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1. mapSelect :: (a -> a) -> Select r a -> Select r a

   transformers	Control.Monad.Trans.Select

   Apply a function to transform the result of a selection computation.

   • runSelect (mapSelect f m) = f .
     runSelect m

2. mapSelectT :: (m a -> m a) -> SelectT r m a -> SelectT r m a

   transformers	Control.Monad.Trans.Select

   Apply a function to transform the result of a selection computation. This has a more restricted type than the map operations for other monad transformers, because SelectT does not define a functor in the category of monads.

   • runSelectT (mapSelectT f m) = f .
     runSelectT m

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

   transformers	Control.Monad.Trans.State.Lazy

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

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

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

   transformers	Control.Monad.Trans.State.Lazy

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

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

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

   transformers	Control.Monad.Trans.State.Strict

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

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

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

   transformers	Control.Monad.Trans.State.Strict

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

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

7. mapWriter :: (Monoid w, Monoid w') => ((a, w) -> (b, w')) -> Writer w a -> Writer w' b

   transformers	Control.Monad.Trans.Writer.CPS

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

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

8. mapWriterT :: (Monad n, Monoid w, Monoid w') => (m (a, w) -> n (b, w')) -> WriterT w m a -> WriterT w' n b

   transformers	Control.Monad.Trans.Writer.CPS

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

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

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

   transformers	Control.Monad.Trans.Writer.Lazy

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

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

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

    transformers	Control.Monad.Trans.Writer.Lazy

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

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

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