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Within LTS Haskell 24.33 (ghc-9.10.3)
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MapUpdate'ENABLE :: MapUpdate'FlagOpriak-protobuf Data.Riak.Proto No documentation available.
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riak-protobuf Data.Riak.Proto No documentation available.
MapNotifyEvent :: EventType -> CULong -> Bool -> Display -> Window -> Window -> Bool -> Eventxmonad-contrib XMonad.Config.Prime No documentation available.
MapRequestEvent :: EventType -> CULong -> Bool -> Display -> Window -> Window -> Eventxmonad-contrib XMonad.Config.Prime No documentation available.
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xmonad-contrib XMonad.Config.Prime No documentation available.
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xmonad-contrib XMonad.Config.Prime No documentation available.
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)base Prelude 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 Prelude 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 Prelude 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.
mapAccumL :: Traversable t => (s -> a -> (s, b)) -> s -> t a -> (s, t b)base Data.List The mapAccumL function behaves like a combination of fmap and foldl; it applies a function to each element of a structure, passing an accumulating parameter from left to right, and returning a final value of this accumulator together with the new structure.
Examples
Basic usage:>>> mapAccumL (\a b -> (a + b, a)) 0 [1..10] (55,[0,1,3,6,10,15,21,28,36,45])
>>> mapAccumL (\a b -> (a <> show b, a)) "0" [1..5] ("012345",["0","01","012","0123","01234"])