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The Ultimate Guide to Rust Programming

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Explore early exit strategies in Rust by learning how break exits loops, continue skips to the next iteration, and how return and the ? operator help manage control flow. Understand the benefits and drawbacks of using continue in loops to write clearer Rust code.

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Let’s look at another example. I want to loop over a bunch of people. I want to say hi to all of the doctors, but not the scientists. Sounds easy enough:

Rust 1.40.0
enum Job {
    Doctor,
    Scientist,
}
struct Person {
    name: String,
    job: Job,
}
fn main() {
    let people = [
        Person { name: "Alice".to_owned(), job: Job::Doctor },
        Person { name: "Bob".to_owned(), job: Job::Scientist },
        Person { name: "Charlie".to_owned(), job: Job::Doctor },
    ];
    for person in &people {
        match person.job {
            Job::Doctor => {
                println!("Hello, {}", person.name);
            }
            Job::Scientist => {
                // don't do anything
            }
        }
    }
}

But now, let’s say that I want to add a new job type, Teacher. And I want to greet the ...