Convert the given number into a roman numeral. All roman numerals answers should be provided in upper-case.

roman-numeral-converter.js

function convertToRoman(num) {
  var singles = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"];
  var tens = ["", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"];
  var hundreds = ["", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"];
  var thousands = ["", "M", "MM", "MMM", "MMMM"];
  //turn the number to a string, split individual characters and then turn each one to a number.
  var length = num.toString().length;
  var numbers = num.toString().split("").map(Number);
  var roman = '';
  var i = 0;
  
  switch (length) {
      
    case 4:
      roman = thousands[numbers[i]];
      i++;
      
    case 3:
      roman += hundreds[numbers[i]];
      i++;
      
    case 2:
      roman += tens[numbers[i]];
      i++;
      
    case 1 :
      roman += singles[numbers[i]];
  }
 return roman;
}

convertToRoman(36);