How to use enum

Structs Enums

2026-04-17T12:05:42+00:00

Define an enum with the `enum` keyword and handle its variants using a `match` expression to ensure all cases are covered.

Define an enum using the enum keyword to list possible variants, then handle them with a match expression.

enum Message {
    Quit,
    Move { x: i32, y: i32 },
    Write(String),
    ChangeColor(u8, u8, u8),
}

fn main() {
    let msg = Message::Quit;
    match msg {
        Message::Quit => println!("Quit"),
        Message::Move { x, y } => println!("Move to {}, {}", x, y),
        Message::Write(text) => println!("Text message: {}", text),
        Message::ChangeColor(r, g, b) => println!("Change color to {}, {}, {}", r, g, b),
    }
}