Repeat a String Repeat a String

repeatStr.js

function repeatStringNumTimes(str, num) {
  if (num === 0 || Math.sign(num) === -1) {
    return ""
  }
  
  let arr = [str]
  let i = 1

  while (i< num) {
    arr.push(str)
    i++
  }
  return arr.join('');
}

repeatStringNumTimes("abc", 3);