Hoogle Search

Within LTS Haskell 24.39 (ghc-9.10.3)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

1. 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

2. 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)

3. 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)

4. 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)

5. 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)

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

   transformers	Control.Monad.Trans.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

   transformers	Control.Monad.Trans.Writer.Strict

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

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

8. mapSize :: Testable prop => (Int -> Int) -> prop -> Property

   QuickCheck	Test.QuickCheck

   Adjust the test case size for a property, by transforming it with the given function.

9. mapSubject :: (b -> a) -> SpecWith a -> SpecWith b

   hspec	Test.Hspec

   Modify the subject under test. Note that this resembles a contravariant functor on the first type parameter of SpecM. This is because the subject is passed inwards, as an argument to the spec item.

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

    mtl	Control.Monad.Cont

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

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

Page 66 of many | Previous | Next