Rust Programming By Example

Iterators

The Rust documentation describes an iterator as Composable external iteration.

They're used a lot in idiomatic Rust code on collection types (slice, Vec, HashMap, and so on) so it's very important to learn to master them. This code will allow us to have a nice introduction. Let's look at the code now:

    slice.iter().map(|highscore| highscore.to_string()).      collect::<Vec<String>>().join(" ")

This is quite difficult to read and understand for the moment, so let's rewrite it as follows:

    slice.iter()
       .map(|highscore| highscore.to_string())
       .collect::<Vec<String>>()
       .join(" ")

Better (or at least more readable!). Now let's go step by step, as follows:

     slice.iter()

Here, we create an iterator from our slice. A really important and ...