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

Yes nested loops, although one is hidden:

bool AnyAny(int[] A, int[]B)
{
    foreach(int i in A)
       if (B.Any(b=> b == i))
           return true;
    return false;
}