DefectingCat/fibonacci.rs

fn main() {
    println!("fibonaaci: {}", fibonaaci(8))
}

fn fibonaaci(n: u128) -> u128 {
    let (mut a, mut b) = (0, 1);
    (1..n).for_each(|_x| (a, b) = (b, a + b));
    a
}