Loop with Break Value

Snippet

Loop with Break Value

Rust's loop can return a value via break. Instead of using break; alone, you write break expression;. This is Rust's equivalent of a return statement inside a loop. The loop block evaluates to the value after break.

snippet.rs

rust

fn main() {
    let result = loop {
        let mut counter = 0;
        counter += 1;
        if counter == 5 {
            break counter * 2;
        }
    };
    println!("Result: {}", result);
}

Breakdown

let result = loop { ... }

The loop block itself produces a value assigned to result.

break counter * 2

Returns counter * 2 (10) and exits the loop immediately.

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Loop with Break Value

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