**foldr** -bytestring

foldr, applied to a binary operator, a starting value (typically the right-identity of the operator), and a list, reduces the list using the binary operator, from right to left:
> foldr f z [x1, x2, ..., xn] == x1 `f` (x2 `f` ... (xn `f` z)...)
*O(n)* foldr, applied to a binary operator, a starting value (typically the right-identity of the operator), and a Text, reduces the Text using the binary operator, from right to left. Subject to fusion.
*O(n)*. Fold the elements in the set using the given right-associative binary operator, such that foldr f z == foldr f z . toAscList.
For example,
> toAscList set = foldr (:) [] set
*O(n)*. Fold the values in the map using the given right-associative binary operator, such that foldr f z == foldr f z . elems.
For example,
> elems map = foldr (:) [] map
> let f a len = len + (length a)
> foldr f 0 (fromList [(5,"a"), (3,"bbb")]) == 4
*O(n)*. Fold the values in the map using the given right-associative binary operator, such that foldr f z == foldr f z . elems.
For example,
> elems map = foldr (:) [] map
> let f a len = len + (length a)
> foldr f 0 (fromList [(5,"a"), (3,"bbb")]) == 4
*O(n)*. Fold the elements in the set using the given right-associative binary operator, such that foldr f z == foldr f z . toAscList.
For example,
> toAscList set = foldr (:) [] set
foldr1 is a variant of foldr that has no starting value argument, and thus must be applied to non-empty lists.
Fold over the elements of a structure, associating to the right, but strictly.

Monadic fold over the elements of a structure, associating to the right, i.e. from right to left.

*O(n)*. A strict version of foldr. Each application of the operator is evaluated before using the result in the next application. This function is strict in the starting value.
*O(n)*. A strict version of foldr. Each application of the operator is evaluated before using the result in the next application. This function is strict in the starting value.
*O(n)*. A strict version of foldr. Each application of the operator is evaluated before using the result in the next application. This function is strict in the starting value.
*O(n)*. A strict version of foldr. Each application of the operator is evaluated before using the result in the next application. This function is strict in the starting value.
*O(n)* A variant of foldr that has no starting value argument, and thus must be applied to a non-empty Text. Subject to fusion.
Consume the chunks of a lazy Text with a natural right fold.
*O(n)*. Fold the keys and values in the map using the given right-associative binary operator, such that foldrWithKey f z == foldr (uncurry f) z . toAscList.
For example,
> keys map = foldrWithKey (\k x ks -> k:ks) [] map
> let f k a result = result ++ "(" ++ (show k) ++ ":" ++ a ++ ")"
> foldrWithKey f "Map: " (fromList [(5,"a"), (3,"b")]) == "Map: (5:a)(3:b)"
*O(n)*. Fold the keys and values in the map using the given right-associative binary operator, such that foldrWithKey f z == foldr (uncurry f) z . toAscList.
For example,
> keys map = foldrWithKey (\k x ks -> k:ks) [] map
> let f k a result = result ++ "(" ++ (show k) ++ ":" ++ a ++ ")"
> foldrWithKey f "Map: " (fromList [(5,"a"), (3,"b")]) == "Map: (5:a)(3:b)"
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