[JavaScript] Convert an integer to roman numeral

integerToRomanNumeral.js

function integerToRomanNumeral(n) {

  let roman = {
    1: "I",
    2: "II",
    3: "III",
    4: "IV",
    5: "V",
    6: "VI",
    7: "VII",
    8: "VIII",
    9: "IX",
    10: "X",
    20: "XX",
    30: "XXX",
    40: "XL",
    50: "L",
    60: "LX",
    70: "LXX",
    80: "LXXX",
    90: "XC",
    100: "C",
    200: "CC",
    300: "CCC",
    400: "CD",
    500: "D",
    600: "DC",
    700: "DCC",
    800: "DCCC",
    900: "CM",
    1000: "M"
  }

  let result = ""
  let r = n

  for (let [key, value] of Object.entries(roman).sort((a,b) => b[0]-a[0])) {
    if (r%key != r) {
      let m = parseInt(r/key)
      for (let i=0; i<m; i++) {
        result += roman[key]
      }
    }
    r = r%key
  }

  return result
}