Helios language/ Functions/

Void functions

Functions that are composed of only print, error, assert, and if-else/switch expressions there-of, return void (()). These kinds of functions can't be called in assignments.

func assert_even(n: Int) -> () {
    assert(n % 2 == 0, "not even")

The syntax for calling user-defined void functions is the same as for print, error and assert:

spending my_validator

func main(_, _, ctx: ScriptContext) -> Bool {