rustlings/solutions/18_iterators/iterators1.rs

// When performing operations on elements within a collection, iterators are
// essential. This module helps you get familiar with the structure of using an
// iterator and how to go through elements within an iterable collection.

fn main() {
    // You can optionally experiment here.
}

#[cfg(test)]
mod tests {
    #[test]
    fn iterators() {
        let my_fav_fruits = ["banana", "custard apple", "avocado", "peach", "raspberry"];

        // Create an iterator over the array.
        let mut fav_fruits_iterator = my_fav_fruits.iter();

        assert_eq!(fav_fruits_iterator.next(), Some(&"banana"));
        assert_eq!(fav_fruits_iterator.next(), Some(&"custard apple"));
        assert_eq!(fav_fruits_iterator.next(), Some(&"avocado"));
        assert_eq!(fav_fruits_iterator.next(), Some(&"peach"));
        assert_eq!(fav_fruits_iterator.next(), Some(&"raspberry"));
        assert_eq!(fav_fruits_iterator.next(), None);
        //                                     ^^^^ reached the end
    }
}