Rust Programming By Example

Saving/loading high scores

To keep things simple, we'll have a very simple file format:

• On the first line, we store the best scores
• On the second line, we store the highest number of lines

Let's start by writing the save function:

    fn slice_to_string(slice: &[u32]) -> String {
      slice.iter().map(|highscore| highscore.to_string()).        collect::<Vec<String>>().join(" ")
    }

    fn save_highscores_and_lines(highscores: &[u32],        number_of_lines: &[u32]) -> bool {
      let s_highscores = slice_to_string(highscores);
      let s_number_of_lines = slice_to_string(number_of_lines);
      write_into_file(format!("{}\n{}\n", s_highscores,          s_number_of_lines)).is_ok()
    }

It was a small lie: there are actually two functions. The first one is just here to make the code smaller ...