#[derive(PartialEq, Debug)]
struct Shoe {
    size: u32,
    style: String,
}

fn shoes_in_my_size(shoe: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
    shoe.into_iter()
        .filter(|s| s.size == shoe_size)
        .collect()
}

#[test]
fn filters_by_size() {
    let shoes = vec![
        Shoe {size: 10, style: String::from("sneaker")},
        Shoe {size: 13, style: String::from("sandal")},
        Shoe {size: 10, style: String::from("boot")},
    ];

    let in_my_size = shoes_in_my_size(shoes, 10);

    assert_eq!(in_my_size,  vec![
        Shoe {size: 10, style: String::from("sneaker")},
        Shoe {size: 10, style: String::from("boo")},
    ]);
}

fn main() {
    let shoes = vec![
        Shoe {size: 10, style: String::from("sneaker")},
        Shoe {size: 13, style: String::from("sandal")},
        Shoe {size: 10, style: String::from("boot")},
    ];

    shoes_in_my_size(shoes, 10);
}