Rust code shared from the playground

playground.rs

#[derive(Debug)]
struct User {
    first_name: &'static str,
    last_name: &'static str,
}

impl User {
    fn new(first_name: &'static str, last_name: &'static str) -> User {
        User {
            first_name: first_name,
            last_name: last_name,
        }
    }
}

#[derive(Debug)]
struct State {
    users: Vec<User>,
}

impl State {
    fn new() -> State {
        State { users: vec![] }
    }

    fn add_user(&mut self, first_name: &'static str, last_name: &'static str) {
        self.users.push(User::new(first_name, last_name));
    }

    fn first(self) -> Option<User> {
        if self.users.len() > 0 {
            let user: User = User { ..self.users[0] };
            return Some(user);
        } else {
            return None;
        }
    }
}

fn main() {
    let mut state = State::new();

    state.add_user("hello", "world");

    let first_user = state.first();

    match first_user {
        Some(user) => println!("{} {}", user.first_name, user.last_name),
        None => println!("No user at that index"),
    }
}