Rust

9.4    Combinators

Now that you understand how iterators allow us to traverse collections efficiently, it’s time to look at how we can further enhance iteration using combinators. Combinators are methods provided by the Iterator trait that allow us to transform, filter, or combine elements in a chainable manner. They offer a powerful way to build more complex behaviors from simple operations, making iteration not just efficient but also expressive. Let’s dive into how combinators work and how they can be applied in real-world scenarios through an example.

Consider the following vector containing the names of some fruits:

let words = vec!["apple", "banana", "grape", "orange", "pear"];  

Our task is to capture all the names of the fruits that start ...