If

Basic

func main() {
	i := -1

	if i < 0 {
		println("its less than zero")
	}
}

Short statement

Like a for loop you can begin with a short statement

func main() {
	i := -3

	if a := i + 2; a < 0 {
		println("its less than zero")
	}
}

Else

func main() {
	i := -3

	if i < 0 {
		println("its less than zero")
	} else if i == 0 {
		println("its zero")
	} else {
		println("its more than zero")
	}
}