function convertToRoman(num) {
  var numbs = [1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000];
  var romNum = ['I', 'IV', 'V', 'IX', 'X', 'XL', 'L', 'XC', 'C', 'CD', 'D', 'CM', 'M'];

  var numCopy = num;
  var romanNum = '';

  while (numCopy > 0){
    for (var i = 0; i < numbs.length; i++){
      if (+numbs[i] <= numCopy && +numbs[i] > numCopy){
        romanNum += romNum[i];
        numCopy -= numbs[i];
      }
    }
  }

 return romanNum;
}

convertToRoman(1000);