A function to convert an aribic (base 10) number to a Roman numeral

toRomanNumeral.js

function convertToRoman(num) {
  const romanSymbols = {
    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
  }

  let romanNum = ''

  for (let romanSymbol in romanSymbols) {
    while (num >= romanSymbols[romanSymbol]) {
      romanNum += romanSymbol
      num -= romanSymbols[romanSymbol]
    }
  }

  return romanNum;
}