bonfire-roman-numeral-converter.js

// Bonfire: Roman Numeral Converter
// Author: @minsooshin
// Challenge: http://www.freecodecamp.com/challenges/bonfire-roman-numeral-converter
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function convert(num) {
  var romanMap = {
        "M": 1000,
        "CM": 900,
        "D": 500,
        "CD": 400,
        "C": 100,
        "XC": 90,
        "L": 50,
        "XL": 40,
        "X": 10,
        "IX": 9,
        "V": 5,
        "IV": 4,
        "I": 1
      },
      romanStr = '';
  
  for (var key in romanMap) {
    while (num >= romanMap[key]) {
      romanStr += key;
      num -= romanMap[key];
    }
  }
  
  return romanStr;
}

convert(36);