Examples in V
fn main() {
	println(add(77, 33))
	println(sub(100, 50))

fn add(x int, y int) int {
	return x + y

fn sub(x, y int) int {
	return x - y
A higher order function is a function that takes a function as an argument, or returns a function. Higher order function is in contrast to first order functions, which don’t take a function as an argument or return a function as output.
fn sqr(n int) int {
	return n * n

fn run(value int, op fn(int) int) int {
	return op(value)

fn main()  {
	println(run(5, sqr)) // "25"