arabic2roman.js

function arabic2roman(num) {
  var romans = {
    0:  {"key": 1,    "value": "I"},
    1:  {"key": 4,    "value": "IV" },
    2:  {"key": 5,    "value": "V"},
    3:  {"key": 9,    "value": "IX"},
    4:  {"key": 10,   "value": "X"},
    5:  {"key": 40,   "value": "XL"},
    6:  {"key": 50,   "value": "L"},
    7:  {"key": 90,   "value": "XC"},
    8:  {"key": 100,  "value": "C"},
    9:  {"key": 400,  "value": "CD"},
    10: {"key": 500,  "value": "D"},
    11: {"key": 900,  "value": "CM"},
    12: {"key": 1000, "value": "M"}
  };
  var roman = "";

  while (num > 0) {
    for (var i=romans.length-1; i>=0; i--) {
      if (num >= romans[i].key) {
        roman += romans[i].value;
        num -= romans[i].key;
        break;
      }
    }
  }
 return roman;
}