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Within LTS Haskell 24.3 (ghc-9.10.2)
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mapZeroTerminatedCArray :: (Ptr a -> IO b) -> Ptr (Ptr a) -> IO ()haskell-gi-base Data.GI.Base.BasicConversions No documentation available.
mapGValueArrayWithLength :: Integral a => a -> (Ptr GValue -> IO c) -> Ptr GValue -> IO ()haskell-gi-base Data.GI.Base.GValue Map over the GValues inside a C array.
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)haskell-gi-base Data.GI.Base.ShortPrelude Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results. For a version that ignores the results see mapM_.
Examples
mapM is literally a traverse with a type signature restricted to Monad. Its implementation may be more efficient due to additional power of Monad.mapM_ :: (Foldable t, Monad m) => (a -> m b) -> t a -> m ()haskell-gi-base Data.GI.Base.ShortPrelude Map each element of a structure to a monadic action, evaluate these actions from left to right, and ignore the results. For a version that doesn't ignore the results see mapM. mapM_ is just like traverse_, but specialised to monadic actions.
mapFirst :: (a -> c) -> [(a, b)] -> [(c, b)]haskell-gi-base Data.GI.Base.Utils Given a function and a list of two-tuples, apply the function to every first element of the tuples.
mapFirstA :: Applicative f => (a -> f c) -> [(a, b)] -> f [(c, b)]haskell-gi-base Data.GI.Base.Utils Applicative version of mapFirst.
mapSecond :: (b -> c) -> [(a, b)] -> [(a, c)]haskell-gi-base Data.GI.Base.Utils Same for the second element.
mapSecondA :: Applicative f => (b -> f c) -> [(a, b)] -> f [(a, c)]haskell-gi-base Data.GI.Base.Utils Applicative version of mapSecond.
mapAccept :: Accept a => [(a, b)] -> ByteString -> Maybe bhttp-media Network.HTTP.Media The equivalent of matchAccept above, except the resulting choice is mapped to another value. Convenient for specifying how to translate the resource into each of its available formats.
getHeader >>= maybe render406Error renderResource . mapAccept [ ("text" // "html", asHtml) , ("application" // "json", asJson) ]mapAcceptBytes :: [(ByteString, b)] -> ByteString -> Maybe bhttp-media Network.HTTP.Media A specialisation of mapAccept that only takes ByteString as its input, to avoid ambiguous-type errors when using string literal overloading.
getHeader >>= maybe render406Error encodeResourceWith . mapAcceptBytes [ ("abc", abc) , ("xyz", xyz) ]