Pattern Guards and Bindings

Use @ bindings and match guards in patterns.

Difficulty

Advanced

Code

fn main() {
    let x = 5;
    match x {
        n @ 1..=5 => println!("1-5: {}", n),
        n @ 6..=10 => println!("6-10: {}", n),
        n => println!("other: {}", n),
    }

    let msg = Some(42);
    match msg {
        Some(n) if n > 100 => println!("big: {}", n),
        Some(n) => println!("small: {}", n),
        None => println!("none"),
    }
}

Explanation

@ bindings capture values. Guards add conditions.

Key Concepts

• Read the code carefully and understand the data flow
• Try modifying the example to see how it changes behavior
• Run this code in the Rust Playground

Related Topics

Browse more examples in the patterns category to build a complete understanding of this topic.