How to create threads in Rust

Use the std::thread module to spawn a new thread that runs concurrently with the main thread.

use std::thread;
use std::time::Duration;

fn main() {
    let handle = thread::spawn(|| {
        for i in 1..10 {
            println!("hi number {} from the spawned thread!", i);
            thread::sleep(Duration::from_millis(1));
        }
    });

    for i in 1..5 {
        println!("hi number {} from the main thread!", i);
    }

    handle.join().unwrap();
}

Creating a thread lets your program run multiple tasks at the same time, like a chef chopping vegetables while the soup simmers. You use this when you need to perform long-running tasks without freezing the rest of your application. The main thread waits for the new thread to finish using the join method.