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Within LTS Haskell 24.34 (ghc-9.10.3)

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

   mtl-prelude	MTLPrelude

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

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

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

   mtl-prelude	MTLPrelude

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

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

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

   mtl-prelude	MTLPrelude

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

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

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

   mtl-prelude	MTLPrelude

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

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

5. mapParseError :: Ord e' => (e -> e') -> ParseError s e -> ParseError s e'

   network-uri-template	Network.URI.Template.Internal.Parse

   Modify the custom data component in a parse error. This could be done via fmap if not for the Ord constraint.

6. maple :: OEISSeq -> Texts

   oeis2	Math.OEIS

   No documentation available.

7. maple :: OEISSeq -> Texts

   oeis2	Math.OEIS.Types

   No documentation available.

8. mapMaybeFieldsWithNulls :: ProductProfunctor p => p (Field SqlBool) (Field SqlBool) -> WithNulls p a b -> WithNulls p (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.Internal.MaybeFields

   This is only safe if b is OK with having nulls passed through it when they claim to be non-null.

9. mapIO :: HasCallStack => (a -> IO b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Apply a computation to the result of a parser This is intended for use-cases like resolving a file to an absolute path. It is morally ok for read-only IO actions but you will have a bad time if the action is not read-only.

10. mapIO :: HasCallStack => (a -> IO b) -> Parser a -> Parser b

    opt-env-conf	OptEnvConf.Parser

    Apply a computation to the result of a parser This is intended for use-cases like resolving a file to an absolute path. It is morally ok for read-only IO actions but you will have a bad time if the action is not read-only.

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