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Within LTS Haskell 24.17 (ghc-9.10.3)
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mapAccumL :: (acc -> Word8 -> (acc, Word8)) -> acc -> ByteString -> (acc, ByteString)bytestring Data.ByteString.Lazy The mapAccumL function behaves like a combination of map and foldl; it applies a function to each element of a ByteString, passing an accumulating parameter from left to right, and returning a final value of this accumulator together with the new ByteString.
mapAccumR :: (acc -> Word8 -> (acc, Word8)) -> acc -> ByteString -> (acc, ByteString)bytestring Data.ByteString.Lazy The mapAccumR function behaves like a combination of map and foldr; it applies a function to each element of a ByteString, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new ByteString.
mapAccumL :: (acc -> Char -> (acc, Char)) -> acc -> ByteString -> (acc, ByteString)bytestring Data.ByteString.Lazy.Char8 The mapAccumL function behaves like a combination of map and foldl; it applies a function to each element of a ByteString, passing an accumulating parameter from left to right, and returning a final value of this accumulator together with the new ByteString.
mapAccumR :: (acc -> Char -> (acc, Char)) -> acc -> ByteString -> (acc, ByteString)bytestring Data.ByteString.Lazy.Char8 The mapAccumR function behaves like a combination of map and foldr; it applies a function to each element of a ByteString, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new ByteString.
mapAccumL :: (a -> Char -> (a, Char)) -> a -> Text -> (a, Text)text Data.Text O(n) Like a combination of map and foldl'. Applies a function to each element of a Text, passing an accumulating parameter from left to right, and returns a final Text. Performs replacement on invalid scalar values.
mapAccumR :: (a -> Char -> (a, Char)) -> a -> Text -> (a, Text)text Data.Text The mapAccumR function behaves like a combination of map and a strict foldr; it applies a function to each element of a Text, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new Text. Performs replacement on invalid scalar values.
mapAccumL :: (a -> Char -> (a, Char)) -> a -> Stream Char -> (a, Text)text Data.Text.Internal.Fusion O(n) Like a combination of map and foldl'. Applies a function to each element of a Text, passing an accumulating parameter from left to right, and returns a final Text. Properties
mapAccumL g z0 . stream = mapAccumL g z0
mapAccumL :: (a -> Char -> (a, Char)) -> a -> Text -> (a, Text)text Data.Text.Lazy O(n) Like a combination of map and foldl'. Applies a function to each element of a Text, passing an accumulating parameter from left to right, and returns a final Text. Performs replacement on invalid scalar values.
mapAccumR :: (a -> Char -> (a, Char)) -> a -> Text -> (a, Text)text Data.Text.Lazy The mapAccumR function behaves like a combination of map and a strict foldr; it applies a function to each element of a Text, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new Text. Performs replacement on invalid scalar values.
mapAccum :: (a -> b -> (a, c)) -> a -> IntMap b -> (a, IntMap c)containers Data.IntMap.Internal The function mapAccum threads an accumulating argument through the map in ascending order of keys.
let f a b = (a ++ b, b ++ "X") mapAccum f "Everything: " (fromList [(5,"a"), (3,"b")]) == ("Everything: ba", fromList [(3, "bX"), (5, "aX")])