func p(s []int) {
    fmt.Println(s, len(s), cap(s))
}

func main() {
    f := make([]int, 2, 4)
    h := f[:]

    f = append(f, 11)
    h = append(h, 22)
    f = append(f, 33)
    f = append(f, 44)


    p(f)
    p(h)

}