Enums

Exercises

Definition 1

// Complete the code by addressing the TODO.

#[derive(Debug)] // this line makes the enum variants printable!
enum Message {
    // TODO: define a few types of messages as used below
}

fn main() {
    println!("{:?}", Message::Quit);
    println!("{:?}", Message::Echo);
    println!("{:?}", Message::Move);
    println!("{:?}", Message::ChangeColor);
}

#[derive(Debug)]
enum Message {
  Quit,
  Echo,
  Move,
  ChangeColor,
}

fn main() {
  println!("{:?}", Message::Quit);
  println!("{:?}", Message::Echo);
  println!("{:?}", Message::Move);
  println!("{:?}", Message::ChangeColor);
}

Definition 2

// Complete the code by addressing the TODO.

#[derive(Debug)] // this line makes the enum variants printable!
enum Message {
    // TODO: define the different variants used below
}

impl Message {
    fn call(&self) {
        println!("{:?}", self);
    }
}

fn main() {
    let messages = [
        Message::Move { x: 10, y: 30 },
        Message::Echo(String::from("hello world")),
        Message::ChangeColor(200, 255, 255),
        Message::Quit,
    ];

    for message in &messages {
        message.call();
    }
}

#[derive(Debug)]
enum Message {
  Move { x: i32, y: i32 },
  Echo(String),
  ChangeColor(u8, u8, u8),
  Quit,
}

impl Message {
  fn call(&self) {
      println!("{:?}", self);
  }
}

fn main() {
  let messages = [
      Message::Move { x: 10, y: 30 },
      Message::Echo(String::from("hello world")),
      Message::ChangeColor(200, 255, 255),
      Message::Quit,
  ];

  for message in &messages {
      message.call();
  }
}