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use std::mem;
#[rustfmt::skip]
#[allow(unused_variables, unused_assignments)]
fn main() {
let my_option: Option<&str> = None;
// `unwrap` of an `Option` after checking if it is `None` will panic.
// Use `if-let` instead.
if let Some(value) = my_option {
println!("{value}");
}
// A comma was missing.
let my_arr = &[
-1, -2, -3,
-4, -5, -6,
];
println!("My array! Here it is: {my_arr:?}");
let mut my_empty_vec = vec![1, 2, 3, 4, 5];
// `resize` mutates a vector instead of returning a new one.
// `resize(0, …)` clears a vector, so it is better to use `clear`.
my_empty_vec.clear();
println!("This Vec is empty, see? {my_empty_vec:?}");
let mut value_a = 45;
let mut value_b = 66;
// Use `mem::swap` to correctly swap two values.
mem::swap(&mut value_a, &mut value_b);
println!("value a: {value_a}; value b: {value_b}");
}
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