1 2 3 4 5 6 7 8 9
require "pp" arr1 = [1, 2, 3, 3, 4] arr2 = [3, 4, 5] pp arr1 | arr2 pp arr1 & arr2 pp arr1 + arr2 pp arr1 - arr2
1 2 3 4
[1, 2, 3, 4, 5] [3, 4] [1, 2, 3, 3, 4, 3, 4, 5] [1, 2]