fn fact_recursive(n) {
    if n <= 1 {
        return 1;
    }
    return n * fact_recursive(n-1);
}

fn fact_imperative(n) {
    if n <= 1 {
        return 1;
    }
    let res = 1;
    for i: 1..=n {
        res *= i;
    }
    return res;
}

fn fact_pipeline(n) {
    if n <= 1 {
        return 1;
    }
    return 1..=n |// \*;
}

# 10*9*8*7*6*5*4*3*2*1 = 10
println(fact_recursive(10));
println(fact_imperative(10));
println(fact_pipeline(10));