FreeCodeCamp challenge: repeat a string

repeat a stringa FreeCodeCamp challenge

Repeat a given string (first argument) num times (second argument). Return an empty string if num is not a positive number.

Here are some helpful links:

Global String Object

function repeatStringNumTimes(str, num) {
  // repeat after me
  if ( num < 0) {
    console.log('""');
    overlay('""');
    return '';
  } else {
    console.log(str.repeat(num));
    overlay(str.repeat(num));
    return str.repeat(num);
  }
}