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Within LTS Haskell 24.28 (ghc-9.10.3)
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mapRegionB :: Region -> (Char -> Char) -> BufferM ()yi-core Yi.Buffer.Region Map the given function over the characters in the region.
mapRegionB :: Region -> (Char -> Char) -> BufferM ()yi-core Yi.Config.Simple Map the given function over the characters in the region.
mapLines :: (YiString -> YiString) -> YiString -> YiStringyi-core Yi.String A helper function for creating functions suitable for modifySelectionB and modifyRegionB. To be used when the desired function should map across the lines of a region.
mapWindows :: (Window -> Window) -> Tab -> Tabyi-core Yi.Tab A specialised version of "fmap".
mapAdjust' :: Ord k => (a -> a) -> k -> Map k a -> Map k ayi-language Yi.Utils As Map.adjust, but the combining function is applied strictly.
mapFromFoldable :: (Foldable t, Ord k) => t (k, a) -> Map k ayi-language Yi.Utils Generalisation of fromList to arbitrary foldables.
mapAndUnzipM :: Applicative m => (a -> m (b, c)) -> [a] -> m ([b], [c])base-compat-batteries Control.Monad.Compat The mapAndUnzipM function maps its first argument over a list, returning the result as a pair of lists. This function is mainly used with complicated data structures or a state monad.
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)base-compat-batteries Control.Monad.Compat 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 ()base-compat-batteries Control.Monad.Compat 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.
mappend :: Monoid a => a -> a -> abase-compat-batteries Data.Monoid.Compat An associative operation NOTE: This method is redundant and has the default implementation mappend = (<>) since base-4.11.0.0. Should it be implemented manually, since mappend is a synonym for (<>), it is expected that the two functions are defined the same way. In a future GHC release mappend will be removed from Monoid.