src/doc/book/listings/ch18-patterns-and-matching/listing-18-01/src/main.rs

   1 fn main() {
   2     let favorite_color: Option<&str> = None;
   3     let is_tuesday = false;
   4     let age: Result<u8, _> = "34".parse();
   5
   6     if let Some(color) = favorite_color {
   7         println!("Using your favorite color, {color}, as the background");
   8     } else if is_tuesday {
   9         println!("Tuesday is green day!");
  10     } else if let Ok(age) = age {
  11         if age > 30 {
  12             println!("Using purple as the background color");
  13         } else {
  14             println!("Using orange as the background color");
  15         }
  16     } else {
  17         println!("Using blue as the background color");
  18     }
  19 }