conteo de forma ascendente y descendente del 1 al 10

function countDown(num) {
  if (num <= 0) {
    console.log("All done!");
    return;
  }
  console.log(num);
  num--;
  countDown(num);
}

countDown(10);

function countUp(num) {
  if (num >= 10) {
    console.log("All done!");
    return;
  }
  console.log(num);
  num++;
  countUp(num);
}

countUp(1);