Rust Programming Cookbook

How to do it...

Let's go through some steps to handle errors seamlessly:

1. Create a new project with cargo new exceptional-results --lib and open it with VS Code.
2. Open src/lib.rs and replace the existing test with a new test:

    #[test]    fn positive_results() {       // code goes here    }

3. As the name suggests, we'll add some positive result tests in the function's body. Let's start with a declaration and something simple. Replace the preceding // code goes here section with the following:

        let ok: Result<i32, f32> = Ok(42);        assert_eq!(ok.and_then(|r| Ok(r + 1)), Ok(43));        assert_eq!(ok.map(|r| r + 1), Ok(43));

4. Let's add some more variation since multiple Result types can behave just like Booleans. Add some more code into the good_results test: