Nodejs Utililty Methods String to Byte Convert

String.prototype.getBytes = function() {   
      var cArr = this.match(/[^\x00-\xff]/ig);   
      return this.length + (cArr == null ? 0 : cArr.length*2);   

String.prototype.getBytes = function () {
    var bytes = [];
    for (var i = 0; i < this.length; i++) {
        bytes.push(this.charCodeAt(i));
    return bytes;
};

function addAll(arr1, arr2) {
  var i=0;
  for(i=0;i<arr2.length;i++) {
    arr1.push(arr2[i]);
String.prototype.getBytes = function() {
    return encodeURIComponent(this).replace(/%../g, 'x').length;
};
...

var crypto = require('crypto')
String.prototype.getBytes = function () {
  var bytes = [];
  for (var i = 0; i < this.length; ++i) {
    bytes.push(this.charCodeAt(i));
  return bytes;
};
module.exports = function convert(secretKey) {
...

String.prototype.toByteString = function()
   var ar = this.split(' '),
     res = "";
   for(var i = 0; i < ar.length; ++i)
    res += String.fromCharCode( parseInt(ar[i], 16) );
   return res;
...

String.prototype.toBytes = function () {
  var bytes = [];
  for (var i = 0; i < this.length; ++i) {
      bytes.push(this.charCodeAt(i));
  return bytes;
};

String.prototype.toBytes = function () {
  var i, ii, bytes = [];
  for (i = 0, ii = this.length; i < ii; i += 1) {
    bytes.push(this.charCodeAt(i));
  return bytes;
};

String.prototype.toBytes = String.prototype.toBytes || function () {
    var BYTE = 8,
        BYTES = 2,
        MAX = Math.pow(2,BYTE)-1,
        c = '',
        buf,
        len = this.length,
        bytes = [];
    for (var i = 0; i < len; i++) {
...