Convert numbers to FA/EN [alternative]

fa.en.numbers.js

/**
 * Convert English numbers to Persian.
 *
 * @param {string} value
 * @return {string} converted string.
 */
function faNumbers(value) {
  if (typeof value === "number") {
    var value = value.toString(); 
  }

  return value.split('').reduce(function(result, char) {
      var charCode = char.charCodeAt(0)
      if (charCode >= 48 && charCode <= 57) { // when charachter is 0 to 9
          return result + String.fromCharCode(charCode + 1728)
      }
      return result + char;
  }, "");
}

/**
 * Convert Persian/Arabic numbers to English.
 *
 * @param {string} value
 * @return {string} converted string.
 */
function enNumbers(value) {
  return value.split('').reduce(function(result, char) {
      var charCode = char.charCodeAt(0)
      if (charCode >= 1776 && charCode <= 1785) { // when charachter is ۰ to ۹ (persian nums)
          return result + String.fromCharCode(charCode - 1728)
      }
      if (charCode >= 1632 && charCode <= 1641) { // when charachter is ٠ to ٩ (arabic nums)
          return result + String.fromCharCode(charCode - 1584)
      }
      return result + char;
  }, "");
}



var log = console.log;

log(enNumbers("٠١٢٣٤٥٦٧٨٩")); // arabic
log(enNumbers("۰۱۲۳۴۵۶۷۸۹.")); // persian

log(faNumbers("0123456789"));
log(faNumbers("a123.44.51n"));
log(faNumbers("1397/10/01"));
log(faNumbers("1397-03-25"));
log(faNumbers("600,000,000"));
log(faNumbers(1234567890));  // by int input.