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

This example demonstrates how to use pattern guards and bindings in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

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