The Ultimate Guide to Rust Programming/

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More Teachers

More Teachers

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I’m not happy with just talking about teachers. I want to know if the teacher is teaching math or art. Let’s rewrite our Job type as:

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enum Job {
    ArtTeacher,
    MathTeacher,
    Scientist,
}

This works, but I don’t like it that much. I’ll give you two reasons why; first, let’s say that I want to write a method is_teacher. With the enum above, I can write something like:

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impl Person {
    fn is_teacher(&self) -> bool {
        match self.job {
            Job::ArtTeacher => true,
            Job::MathTeacher => true,
            Job::Scientist => false,
        }
    }
}

As I started adding physics, economics, and other teachers, this is just going to keep growing. I don’t like that. There’s nothing in the Job enum telling me that there’s some ...