NumberToRomanNums.js

var characters = [
  {
    key: 'I',
    value: 1
  },
  {
    key: 'V',
    value: 5
  },
  {
    key: 'X',
    value: 10    },
  {
    key: 'L',
    value: 50
  },
  {
    key: 'C',
    value: 100
  },
  {
    key: 'D',
    value: 500
  },
  { 
    key: 'M',
    value: 1000
  }];
(function () {
  characters = characters.sort((a, b) => {
    if(a.value > b.value) {
      return 1;
    }
    if (a.value < b.value) {
      return -1;
    }
    return 0;
  });
  var number = parseInt(process.argv[2]);
  var output = "";
  while(number !== 0)
    for(var i = characters.length - 1; i >= 0; i--)
      if (number >= characters[i].value) {
        output += characters[i].key;
        number -= characters[i].value;
        break;
      }
  console.log(output);
})();