fn main() {
    // retain: keep elements matching predicate
    let mut v = vec![1, 2, 3, 4, 5, 6];
    v.retain(|&x| x % 2 == 0);
    println!("evens: {:?}", v);

    // dedup: remove consecutive duplicates
    let mut v = vec![1, 1, 2, 2, 3, 3, 3];
    v.dedup();
    println!("dedup: {:?}", v);

    // windows: sliding window
    let v = vec![1, 2, 3, 4, 5];
    for w in v.windows(3) {
        println!("window: {:?}", w);
    }

    // chunks: non-overlapping chunks
    let v = vec![1, 2, 3, 4, 5, 6, 7];
    for c in v.chunks(3) {
        println!("chunk: {:?}", c);
    }
}