ZoKrates/zokrates_cli/examples/book/conditional_expensive.zok

def cheap(field x) -> field {
    return x + 1;
}

def expensive(field x) -> field {
    return x**1000;
}

def main(field x) -> field {
    return if x == 1 {
        cheap(x)
    } else {
        expensive(x) // both branches executed
    };
}