rails - Finding intersections between multiple arrays

Question

I am trying to find the intersection values between multiple arrays.

for example

code1 = [1,2,3]
code2 = [2,3,4]
code3 = [0,2,6]

So the

Answer 1

Use the & method of Array which is for set intersection.

For example:

> [1,2,3] & [2,3,4] & [0,2,6]
=> [2]