1. Open the Cargo.toml file that has been generated earlier for you.

2. In the bin folder, create a file called iterator_step_by.rs.

3. Add the following code, and run it with cargo run --bin iterator_step_by:

1   #![feature(iterator_step_by)]
2   
3   fn main() {
4     // step_by() will start on the first element of an iterator,
5     // but then skips a certain number of elements on every  
      iteration
6     let even_numbers: Vec<_> = (0..100).step_by(2).collect();
7     println!("The first one hundred even numbers: {:?}",  
      even_numbers);
8   
9     // step_by() will always start at the beginning.
10    // If you need to skip the first few elements as well, use  
      skip()
11    let some_data = ["Andrei", "Romania", "Giuseppe", "Italy",  
      "Susan", "Britain"];
12    let countries: Vec<_> =  
      some_data.iter().skip(1).step_by(2).collect();
13    println!("Countries in the data: {:?}", countries);
14  
15    let grouped_stream = "Aaron 182cm 70kg Alice 160cm 90kg Bob 
      197cm 83kg";
16    let weights: Vec<_> = grouped_stream
17      .split_whitespace()
18      .skip(2)
19      .step_by(3)
20      .collect();
21    println!("The weights of the people are: {:?}", weights);
22  }