Advanced match patterns and guards

In this section, we'll take a look at some of the advanced usage of match and let patterns. First, let's look at match.

Match guards

We can also use match guards on arms (if code > 400 || code <= 500) to match on a subset of values. They start with an if expression.

Advanced let destructure

We have the following complex data that we want to match against:

// complex_destructure.rs

enum Foo {
    One, Two, Three
}

enum Bar(Foo);

struct Dummy {
    inner: Bar
}

struct ComplexStruct {
    obj: Dummy
}

fn get_complex_struct() -> ComplexStruct {
    ComplexStruct {
        obj: Dummy { inner: Bar(Foo::Three) }
    }
}

fn main() {
    let a = get_complex_struct();
}