7kyu-lottery-machine.js

// Your task is to write an update for a lottery machine. Its current version produces a sequence of random letters and integers (passed as a string to the function lottery()). Your code inside lottery() must filter out all letters and return unique integers as a string. If there are no integers in the string return - “One more run!”.

// Examples:

// var str = "hPrBKWDH8yc6Lt5NQZWQ";

// lottery(str); // should return "865"

// var str = "ynMAisVpHEqpqHBqTrwH";

// lottery(str); // should return "One more run!"

function lottery(str) {
  let testRegex = /[0-9]/;
  let result = "";

  for (let letter of str) {
    if (testRegex.test(letter)) {
      if (result.indexOf(letter) === -1) {
        result += letter;
      }
    }
  }
  if (result === "") return "One more run!";
  return result;
}