Rust Programming Cookbook

How to do it...

In four easy steps, we'll be able to filter and transform collections in Rust:

1. In order to use an iterator, you have to retrieve it first! Let's do that and implement a test that quickly shows how an iterator works on a regular Rust Vec<T>:

    #[test]    fn getting_the_iterator() {        let v = vec![10, 10, 10];        let mut iter = v.iter();        assert_eq!(iter.next(), Some(&10));        assert_eq!(iter.next(), Some(&10));        assert_eq!(iter.next(), Some(&10));        assert_eq!(iter.next(), None);        for i in v {            assert_eq!(i, 10);        }    }

2. With one test added, let's explore the notion of iterator functions further. They are compose able and let you perform multiple steps in a single iteration (think of adding more things to a single for loop). Additionally, the ...