takeWhile -bytestring -base

takeWhile :: (Char -> Bool) -> Text -> Text
text Data.Text, text Data.Text.Lazy
O(n) takeWhile, applied to a predicate p and a Text, returns the longest prefix (possibly empty) of elements that satisfy p. Subject to fusion.
takeWhileL :: (a -> Bool) -> Seq a -> Seq a
containers Data.Sequence
O(i) applied to a predicate p and a sequence xs, returns the longest prefix (possibly empty) of xs of elements that satisfy p.
takeWhileR :: (a -> Bool) -> Seq a -> Seq a
containers Data.Sequence
O(i) applied to a predicate p and a sequence xs, returns the longest suffix (possibly empty) of xs of elements that satisfy p. takeWhileR p xs is equivalent to reverse (takeWhileL p (reverse xs)).