rustlings/exercises/22_clippy/clippy3.rs

// clippy3.rs
//
// Here's a couple more easy Clippy fixes, so you can see its utility.
// No hints.

#[allow(unused_variables, unused_assignments)]
fn main() {
    let my_option: Option<()> = None;

    // * We have to remove the unwrap() call
    // * and do something with var
    if my_option.is_none() {
        println!("The current value of my_option is {:?}", my_option);
    }

    // * We were missing a comma
    let my_arr = &[-1, -2, -3, -4, -5, -6];
    println!("My array! Here it is: {:?}", my_arr);

    // * So this is how we fix all warnings:
    let mut my_empty_vec = vec![1, 2, 3, 4, 5];
    my_empty_vec.clear();
    println!("This Vec is empty, see? {:?}", my_empty_vec);

    let mut value_a = 45;
    let mut value_b = 66;
    // Let's swap these two!
    // value_a = value_b;
    // value_b = value_a;
    std::mem::swap(&mut value_a, &mut value_b);
    println!("value a: {}; value b: {}", value_a, value_b);
}