Returns 'true' if at least one of the 'l' arrays's elements satisfies the condition 'f'.
Example of use: NArray.Exists (array ["a", "b", "abc", "d", "e"], fun (x) { x.Length > 2 }) evaluates to 'true' as there is one string of length 3 on the list.
NArray Class | Nemerle.Utility Namespace