Converting English & Farsi digits

english-farsi-converter.js

function toFarsiDigit(number) {
  const regex = /[0-9]/g
  let result = number.replace(regex, function (w) {
    return String.fromCharCode(w.charCodeAt(0) + 1728)
  })

  return result
}

function toEnglishDigit(number) {
  const regex = /[\u0660-\u0669\u06F0-\u06F9]/g
  let result = number.replace(regex, function (w) {
    return String.fromCharCode(w.charCodeAt(0) - 1728)
  })

  return result
}

exports.toEnglishDigit = toEnglishDigit
exports.toFarsiDigit = toFarsiDigit