// Callbacks and functional programming (NOT RECOMMENDED)
Callbacks and functional programming (NOT RECOMMENDED)
// Callbacks and functional programming ( NOT RECOMMENDED )
func sum(x ...int) int {
	n := 0
	for _, v := range x {
		n += v
	}
	return n
}
func sum ( x ... int ) int { n := 0 for _ , v := range x { n += v } return n }
Callbacks and functional programming (NOT RECOMMENDED)
Callbacks and functional programming ( NOT RECOMMENDED )