Printing a character a variable number of times with println

Question

I want to use println! and the powerful formatting tools of format! to print a character a specific number of times. Of course this is possible wit

Answer 1

If you want a cleaner way to repeat any Displayable item without creating an intermediate allocation, you can create a wrapper struct and write a custom Display implementation that performs the repetition:

use std::fmt::{self, Display};

#[derive(Clone, Copy)]
struct DisplayRepeat(usize, T);

impl Display for DisplayRepeat {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        for _ in 0..self.0 {
            self.1.fmt(f)?;
        }
        Ok(())
    }
}

fn repeat(times: usize, item: T) -> DisplayRepeat {
    DisplayRepeat(times, item)
}

fn main() {
    println!("Here is love for you: {}", repeat(10, '♥'));
}