Rust Programming Cookbook

How to do it...

In this recipe, we'll add some more threads to do map-style data processing. Follow these steps:

1. Run cargo new multiple-threads to create a new application project and open the directory in Visual Studio Code.
2. In src/main.rs, add the following function on top of main():

use std::thread;////// Doubles each element in the provided chunks in parallel and returns the results./// fn parallel_map(data: Vec<Vec<i32>>) -> Vec<thread::JoinHandle<Vec<i32>>> {    data.into_iter()        .map(|chunk| thread::spawn(move ||         chunk.into_iter().map(|c|          c * 2).collect()))        .collect()}

3. In this function, we spawn a thread for each chunk that has been passed in. This thread only doubles the number and therefore the function returns Vec<i32> for each ...