How to Define and Use Enums in Rust

Structs Enums
2026-04-17T12:05:42+00:00
Define Rust enums with the `enum` keyword and handle their variants using `match` expressions or inherent methods.

Define an enum using the enum keyword to list variants, then use match to handle each case or impl to add methods.

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

impl Message {
    fn call(&self) {
        match self {
            Message::Quit => println!("Quit"),
            Message::Move { x, y } => println!("Move to {}, {}", x, y),
            Message::Write(text) => println!("Text: {}", text),
            Message::ChangeColor(r, g, b) => println!("Color: {}, {}, {}", r, g, b),
        }
    }
}

fn main() {
    let m = Message::Write(String::from("hello"));
    m.call();
}