Filter vector of structs (cloning)

---

examples/vectors/filter-vector-of-structs-with-clone/src/main.rs

#[derive(Debug, Clone)]
#[allow(dead_code)]
struct Something {
    number: i32,
    text: String,
    numbers: Vec<i32>,
}

fn main() {
    let va: Vec<Something> = vec![
        Something {
            number: 1,
            text: String::from("small"),
            numbers: vec![1, 2, 3],
        },
        Something {
            number: 11,
            text: String::from("medium"),
            numbers: vec![11, 12],
        },
        Something {
            number: 101,
            text: String::from("large"),
            numbers: vec![101],
        },
    ];
    println!("{:#?}", &va);

    // This needs the Clone trait above and I am not sure if this does not mean that we duplicate
    // the data.
    let v_big = va
        .iter()
        .filter(|thing| thing.number > 20)
        .cloned()
        .collect::<Vec<Something>>();
    //let v_big = &va.into_iter().filter(|thing| thing.number > 20).collect::<Vec<Something>>();
    println!("{:#?}", &v_big);
    println!("{:#?}", &va);
}

[
    Something {
        number: 1,
        text: "small",
        numbers: [
            1,
            2,
            3,
        ],
    },
    Something {
        number: 11,
        text: "medium",
        numbers: [
            11,
            12,
        ],
    },
    Something {
        number: 101,
        text: "large",
        numbers: [
            101,
        ],
    },
]
[
    Something {
        number: 101,
        text: "large",
        numbers: [
            101,
        ],
    },
]
[
    Something {
        number: 1,
        text: "small",
        numbers: [
            1,
            2,
            3,
        ],
    },
    Something {
        number: 11,
        text: "medium",
        numbers: [
            11,
            12,
        ],
    },
    Something {
        number: 101,
        text: "large",
        numbers: [
            101,
        ],
    },
]