Question

How to generate random string without repetition in Rust

Answer 1

use rand::seq::SliceRandom; // choose
use std::collections::HashSet;

fn generate_unique_random_string(total: usize) -> String {
    let chars: Vec<char> = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".chars().collect();
    let mut used_chars = HashSet::new();
    let mut result = String::new();
    let mut rng = rand::thread_rng();

    while result.len() < total {
        let &random_char = chars.choose(&mut rng).unwrap();
        if used_chars.insert(random_char) {
            result.push(random_char);
        }
    }

    result
}

fn main() {
    println!("{}", generate_unique_random_string(15));
}




/*
run:
  
eThP9niWV65x8aU
  
*/

 

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