如何找到一个与其他数组相交的元素

Question

I have an array like:

a:= [1,2,3,4,5]
b:= [5,6,7,8,9]

How to know array b have contain element in array a without using foreach?

Answer 1

How to know array b have contain element in array a without using foreach?

You can't. And you should not try as this is pointless restriction.