oneOf package:streamly-core

Match any one of the elements in the supplied list.

>>> oneOf xs = Parser.satisfy (`Foldable.elem` xs)

When performance matters a pattern matching predicate could be more efficient than a Foldable datatype:

let p x =
case x of
a -> True
e -> True
_  -> False
in satisfy p

GHC may use a binary search instead of linear search in the list. Alternatively, you can also use an array instead of list for storage and search.

See performance notes in oneOf.

>>> noneOf xs = Parser.satisfy (`Foldable.notElem` xs)