Code shared from the Rust Playground

playground.rs

fn main() {
    let mut arr = [12, 8, 10, 3, 5, 10, 45];
    if let Some(elem) = arr.get(10) {
        println!("Element requested: {}.", elem);
    } else {
        println!(
            "Element at index {} could not be found in an array of size {}.",
            10,
            arr.len()
        );
    }
    print_bars(&arr);
    bubble_it(&mut arr);
    print_bars(&arr);
}

// Print a bar chart with a given array
fn print_bars(arr: &[isize]) {
    for val in arr.iter() {
        print!("{:3}: ", val);
        for _i in 0..*val {
            print!("•");
        }
        println!("");
    }
    println!("");
}

/// Bubble sorting algorithm
fn bubble_it(arr: &mut [isize]) {
    for i in 0..(arr.len() - 1) {
        let mut swaps = 0;
        for j in 0..(arr.len() - i - 1) {
            if arr[j] > arr[j + 1] {
                let temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
                swaps += 1;
            }
        }
        if swaps == 0 {
            break;
        }
    }
}