How to check if an array contains any item of another array

Question

Given 2 int arrays e.g, foo and bar, what\'s the most efficient way to check that the array bar contains at least one item that foo contains. should re

Answer 1

C#3:

bool result = bar.Any(el => foo.Contains(el));

C#4 parallel execution:

bool result = bar.AsParallel().Any(el => foo.AsParallel().Contains(el));