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Within LTS Haskell 24.19 (ghc-9.10.3)

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

   mtl	Control.Monad.State.Strict

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

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

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

   mtl	Control.Monad.Writer.CPS

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

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

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

   mtl	Control.Monad.Writer.CPS

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

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

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

   mtl	Control.Monad.Writer.Lazy

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

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

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

   mtl	Control.Monad.Writer.Lazy

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

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

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

   mtl	Control.Monad.Writer.Strict

   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

   mtl	Control.Monad.Writer.Strict

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

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

8. mapKeyVal :: (Key -> Key) -> (v1 -> v2) -> KeyMap v1 -> KeyMap v2

   aeson	Data.Aeson.KeyMap

   Transform the keys and values of a KeyMap.

9. mapMaybe :: (a -> Maybe b) -> KeyMap a -> KeyMap b

   aeson	Data.Aeson.KeyMap

   Map values and collect the Just results.

10. mapMaybeWithKey :: (Key -> v -> Maybe u) -> KeyMap v -> KeyMap u

    aeson	Data.Aeson.KeyMap

    Map values and collect the Just results.

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