rust_euler1.rs

fn euler1() -> u32 {
    // using fold() instead of sum() because of iter_arith stability
    // "use of unstable library feature 'iter_arith': bounds recently changed (see issue #27739)"
    (1..1000)
        .filter(|n| n % 5 == 0 || n % 3 == 0)
        .fold(0, |acc, n| acc + n)
}