Rust Programming By Example

Highscores loading/overwriting

We already saw how to perform the I/O operations in the previous chapter, so it'll be very quick to do:

const NB_HIGHSCORES: usize = 5;

fn update_vec(v: &mut Vec<u32>, value: u32) -> bool {
    if v.len() < NB_HIGHSCORES {
        v.push(value);        v.sort();
        true
    } else {
        for entry in v.iter_mut() {
            if value > *entry {
                *entry = value;
                return true;
            }
        }
        false
    }
}

fn print_game_information(tetris: &Tetris) {
    let mut new_highest_highscore = true;
    let mut new_highest_lines_sent = true;
    if let Some((mut highscores, mut lines_sent)) =      load_highscores_and_lines() {
        new_highest_highscore = update_vec(&mut highscores,           tetris.score);
        new_highest_lines_sent = update_vec(&mut lines_sent,           tetris.nb_lines);
        if new_highest_highscore || ...