fn main() {
    let v: Vec<i32> = vec!(1, 6, 2, 4, 7, 4);
    //let even = v.iter().filter(|e| *e % 2 == 0).collect::<Vec<i32>>();
    let even = v.iter().filter(|e| *e % 2 == 0).map(|e| *e).collect::<Vec<i32>>();
    println!("{:?}", even);
}