HTMLify

func contain(target int, arr []int) bool {
    for _, v := range arr {
        if v == target {
            return true
        }
    }
    return false
}
func intersection(nums1 []int, nums2 []int) []int {
    var set []int
    for _, n := range nums1 {
        if contain(n, nums2) && !contain(n, set) {
            set = append(set, n)
        }
    }
    return set
}