Returning From Loops

Introduction

In this lab, you will learn about the concept of returning from loops in Rust, which involves retrying an operation until it succeeds and passing the resulting value to the rest of the code by placing it after the break statement within the loop expression.

Note: If the lab does not specify a file name, you can use any file name you want. For example, you can use main.rs, compile and run it with rustc main.rs && ./main.

Skills Graph

Returning from loops

One of the uses of a loop is to retry an operation until it succeeds. If the operation returns a value though, you might need to pass it to the rest of the code: put it after the break, and it will be returned by the loop expression.

fn main() {
    let mut counter = 0;

    let result = loop {
        counter += 1;

        if counter == 10 {
            break counter * 2;
        }
    };

    assert_eq!(result, 20);
}

Summary

Congratulations! You have completed the Returning From Loops lab. You can practice more labs in LabEx to improve your skills.