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Within LTS Haskell 24.4 (ghc-9.10.2)
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mapIndices :: (Ix i, Ix j) => (i, i) -> (i -> j) -> STBitArray s j -> ST s (STBitArray s i)bitwise Data.Array.BitArray.ST Create a new array by reading from another.
mapHandle :: forall (e :: Effects) (es :: Effects) . (Handle h, e :> es) => h e -> h esbluefin-internal Bluefin.Internal Used to create compound effects, i.e. handles that contain other handles.
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bluefin-internal Bluefin.Internal No documentation available.
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butcher UI.Butcher.Monadic map over the out type argument
mapMaybe :: (a -> Maybe b) -> [a] -> [b]cabal-install-solver Distribution.Solver.Compat.Prelude The mapMaybe function is a version of map which can throw out elements. In particular, the functional argument returns something of type Maybe b. If this is Nothing, no element is added on to the result list. If it is Just b, then b is included in the result list.
Examples
Using mapMaybe f x is a shortcut for catMaybes $ map f x in most cases:>>> import GHC.Internal.Text.Read ( readMaybe ) >>> let readMaybeInt = readMaybe :: String -> Maybe Int >>> mapMaybe readMaybeInt ["1", "Foo", "3"] [1,3] >>> catMaybes $ map readMaybeInt ["1", "Foo", "3"] [1,3]
If we map the Just constructor, the entire list should be returned:>>> mapMaybe Just [1,2,3] [1,2,3]
mappend :: Monoid a => a -> a -> acabal-install-solver Distribution.Solver.Compat.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.
mapKeys :: (k1 -> k2) -> PSQ k1 v -> PSQ k2 vcabal-install-solver Distribution.Solver.Modular.PSQ No documentation available.
mapWithKey :: (k -> a -> b) -> PSQ k a -> PSQ k bcabal-install-solver Distribution.Solver.Modular.PSQ No documentation available.
mapFailure :: (fail1 -> fail2) -> RetryLog step fail1 done -> RetryLog step fail2 donecabal-install-solver Distribution.Solver.Modular.RetryLog O(1). Apply a function to the failure value in a log.
mapWeightsWithKey :: Ord w2 => (k -> w1 -> w2) -> WeightedPSQ w1 k v -> WeightedPSQ w2 k vcabal-install-solver Distribution.Solver.Modular.WeightedPSQ O(N log N). Update the weights.