Leet Code: Integer to Roman Numeral

var intToRoman = function(num) {
    // store numerals 
    let romanNums = '';
    // make a graph mapping an array of integers to an array of roman numerals such that an index will map the two as we iterate through the integers array.
    let integers = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1];
    let romans = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I']
    // iterate over integers
    for (var i = 0; i < integers.length; i++) {
      // while the remainder of the input number divided by the roman numeral's integer is greater than than the integer at i ...
      while(num%integers[i] < num) {
        // subtract the integer at i from the number
        num -= integers[i];
        // add the roman numeral to the string
        romanNums += romans[i];
      }
    }
  // return the string
  return romanNums;
};