# map -text -bytestring

map f xs is the list obtained by applying f to each element of xs, i.e., > map f [x1, x2, ..., xn] == [f x1, f x2, ..., f xn] > map f [x1, x2, ...] == [f x1, f x2, ...]
O(n*min(n,W)). map f s is the set obtained by applying f to each element of s. It's worth noting that the size of the result may be smaller if, for some (x,y), x /= y && f x == f y
O(n). Map a function over all values in the map. > map (++ "x") (fromList [(5,"a"), (3,"b")]) == fromList [(3, "bx"), (5, "ax")]
O(n). Map a function over all values in the map. > map (++ "x") (fromList [(5,"a"), (3,"b")]) == fromList [(3, "bx"), (5, "ax")]
O(n*log n). map f s is the set obtained by applying f to each element of s. It's worth noting that the size of the result may be smaller if, for some (x,y), x /= y && f x == f y
mapM f is equivalent to sequence . map f.
mapM_ f is equivalent to sequence_ . map f.
The mapAccumL function behaves like a combination of map and foldl; it applies a function to each element of a list, passing an accumulating parameter from left to right, and returning a final value of this accumulator together with the new 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.
The mapAccumR function behaves like a combination of map and foldr; it applies a function to each element of a list, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new list.
The mapAccumR function behaves like a combination of fmap and foldr; it applies a function to each element of a structure, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new structure.
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-transforming monad.
This function maps one exception into another as proposed in the paper "A semantics for imprecise exceptions".
This function maps one exception into another as proposed in the paper "A semantics for imprecise exceptions".
Map each element of a structure to a monadic action, evaluate these actions from left to right, and ignore the results.
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 just Just b, then b is included in the result list.
O(n). 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")])
O(n). 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")])
O(n). The function mapAccumR threads an accumulating argument through the map in descending order of keys.
O(n). The function mapAccumR threads an accumulating argument through the map in descending order of keys.
O(n). The function mapAccumWithKey threads an accumulating argument through the map in ascending order of keys. > let f a k b = (a ++ " " ++ (show k) ++ "-" ++ b, b ++ "X") > mapAccumWithKey f "Everything:" (fromList [(5,"a"), (3,"b")]) == ("Everything: 3-b 5-a", fromList [(3, "bX"), (5, "aX")])
O(n). The function mapAccumWithKey threads an accumulating argument through the map in ascending order of keys. > let f a k b = (a ++ " " ++ (show k) ++ "-" ++ b, b ++ "X") > mapAccumWithKey f "Everything:" (fromList [(5,"a"), (3,"b")]) == ("Everything: 3-b 5-a", fromList [(3, "bX"), (5, "aX")])
Constructs a new array derived from the original array by applying a function to each of the elements.
Apply a function to transform the result of a continuation-passing computation. *  (mapCont f m) = f . runCont
Apply a function to transform the result of a continuation-passing computation. *  (mapContT f m) = f . runContT
O(n). Map values and separate the Left and Right results. > let f a = if a < "c" then Left a else Right a > mapEither f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (fromList [(3,"b"), (5,"a")], fromList [(1,"x"), (7,"z")]) > > mapEither (\ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (empty, fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
O(n). Map values and separate the Left and Right results. > let f a = if a < "c" then Left a else Right a > mapEither f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (fromList [(3,"b"), (5,"a")], fromList [(1,"x"), (7,"z")]) > > mapEither (\ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (empty, fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")])
O(n). Map keys/values and separate the Left and Right results. > let f k a = if k < 5 then Left (k * 2) else Right (a ++ a) > mapEitherWithKey f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (fromList [(1,2), (3,6)], fromList [(5,"aa"), (7,"zz")]) > > mapEitherWithKey (\_ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (empty, fromList [(1,"x"), (3,"b"), (5,"a"), (7,"z")])
O(n). Map keys/values and separate the Left and Right results. > let f k a = if k < 5 then Left (k * 2) else Right (a ++ a) > mapEitherWithKey f (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (fromList [(1,2), (3,6)], fromList [(5,"aa"), (7,"zz")]) > > mapEitherWithKey (\_ a -> Right a) (fromList [(5,"a"), (3,"b"), (1,"x"), (7,"z")]) > == (empty, fromList [(1,"x"), (3,"b"), (5,"a"), (7,"z")])
Map the unwrapped computation using the given function. *  (mapErrorT f m) = f (runErrorT >