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

   monadology	Control.Monad.Ology.Specific.ReaderT

   Transform the value returned by a Reader.

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

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

   monadology	Control.Monad.Ology.Specific.ReaderT

   Transform the computation inside a ReaderT.

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

3. mapResultFailure :: (e1 -> e2) -> Result e1 a -> Result e2 a

   monadology	Control.Monad.Ology.Specific.Result

   No documentation available.

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

   monadology	Control.Monad.Ology.Specific.StateT

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

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

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

   monadology	Control.Monad.Ology.Specific.StateT

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

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

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

   monadology	Control.Monad.Ology.Specific.WriterT

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

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

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

   monadology	Control.Monad.Ology.Specific.WriterT

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

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

8. mapFst :: (a -> c) -> (a, b) -> (c, b)

   monoid-transformer	Data.Monoid.State

   No documentation available.

9. mapGroups :: (Collection c2, Monoid (c2 v2), Ord k2) => (Group k1 (c1 v1) -> Group k2 (c2 v2)) -> Multimap c1 k1 v1 -> Multimap c2 k2 v2

   more-containers	Data.Multimap

   Maps over the multimap's groups. This method can be used to convert between specific multimaps, for example:

   let m1 = fromList [('a', 1), ('a', 1)] :: ListMultimap Char Int
   let m2 = mapGroups (fmap Set.fromList) m1 :: SetMultimap Char Int
   

10. mapCounts :: Ord v => (Int -> Int) -> Multiset v -> Multiset v

    more-containers	Data.Multiset

    Maps on the multiset's counts. Groups with resulting non-positive counts will be removed from the final multiset.

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