roman-numeral-converter.js

// Roman Numeral Converter

/*
Convert the given number into a roman numeral.

All roman numerals answers should be provided in upper-case.
*/

function convertToRoman(num) {
  const arr = [
      {
          symbol: 'M',
          value: 1000
      },
      {
          symbol: 'CM',
          value: 900
      },
      {
          symbol: 'D',
          value: 500
      },
      {
          symbol: 'CD',
          value: 400
      },
      {
          symbol: 'C',
          value: 100
      },
      {
          symbol: 'XC',
          value: 90
      },
      {
          symbol: 'L',
          value: 50
      },
      {
          symbol: 'XL',
          value: 40
      },
      {
          symbol: 'X',
          value: 10
      },
      {
          symbol: 'IX',
          value: 9
      },
      {
          symbol: 'V',
          value: 5
      },
      {
          symbol: 'IV',
          value: 4
      },
      {
          symbol: 'I',
          value: 1
      }
  ];

  return arr.reduce((result, key) => {

    while (num >= key.value) {
      result += key.symbol;
      num -= key.value;
    }
    return result;
  }, '');
}

convertToRoman(36);