Hello world!

Cargo.toml

[package]
name = "hello-world"
version = "0.1.0"
authors = ["holi0317 <holliswuhollis@gmail.com>"]

[dependencies]
rand = "0.4.2"

main.rs

extern crate rand;

use std::{time, thread};
use std::io::{self, Write};
use rand::{thread_rng, Rng};

const EREASE_SEQUENCE: &str = "\x1B[D\x1B[K";
const SLEEP_DUR: u64 = 70;
const TARGET: &str = "Hello, world!";

fn main() {
    println!();
    for c in TARGET.chars() {
        let c = c.to_string();

        let mut rng = thread_rng();
        let mut generator = rng
            .gen_iter::<u8>()
            .filter(|&n| n >= 32 && n <= 126)
            .map(|n| String::from_utf8(vec!(n)).unwrap());

        for random in generator {
            if random != c {
                print!("{}", random);
                io::stdout().flush().unwrap();

                thread::sleep(time::Duration::from_millis(SLEEP_DUR));

                print!("{}", EREASE_SEQUENCE);
                io::stdout().flush().unwrap();
            } else {
                break
            }
        }
        print!("{}", c);
    }

    println!();
}

REDME.md

Hello world

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