Passing variables to a thread

Multi-threaded operations

use std::thread;

let nums1 = vec![1, 2, 3];

let handle = thread::spawn(move || {
        println!("nums1 is {:?}", nums1);
});

//nums1.push(4); <-Error
handle.join().unwrap();

let mut nums2 = vec![1, 2, 3];

std::thread::scope(|s| {
        s.spawn(|| {
                println!("nums2 is {:?}", nums2);
        });
});

nums2.push(4);
println!("nums2 is {:?}", nums2);

Use the "move" keyword to indicate that the variable is passed to the secondary thread and will not be used in the main thread.
std::thread::scope provides the necessary guarantee that any spawned threads will complete before returning, allowing data to be borrowed safely.