Format string with constant number of characters

Question

I want my string to be displayed with 4 characters like this: "a" -> "a " when I do format!("{}", "a").

I read the format documentation, and tried several solutions like {:<4} but it didn't work.

Answer 1

As fjh says, this works:

fn main() {
    assert_eq!("a   ", format!("{:<4}", 'a'));
    assert_eq!("a   ", format!("{:<4}", "a"));
}