Nodejs Utililty Methods Random String Get

String.prototype.randomAnagram = function () {
  return this.split('').sort(function () {
    return 0.5 - Math.random();
  }).join('');
};

String.prototype.randomBetween = function(min, max) {
  var hash = this.getHashCode();
    min = min || 0;
    max = max || 1;
    var seed = (hash * 9301 + 49297) % 233280;
    var rnd = Math.abs(seed / 233280.0);
    return min + rnd * (max - min);
};

function randomString(bits){
    var chars,rand,i,ret
      chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
      ret=''
      while(bits > 0){
        rand=Math.floor(Math.random()*0x100000000) 
        for(i=26; i>0 && bits>0; i-=6, bits-=6) ret+=chars[0x3F & rand >>> i]}
      return ret
console.log(0x3F);
console.log(randomString(30))
var test = function(){
};
var s = new String(test);
console.log(s.substring(s.indexOf("/*") + 3, s.lastIndexOf("*/")));
Function.prototype.getstr = function() {  
    var lines = new String(this);  
    lines = lines.substring(lines.indexOf("/*") + 3, lines.lastIndexOf("*/"));  
    return lines;  
};
String.prototype.$ = function(r, v){ return this.replace(new RegExp('<!-- ' + r + ' -->', 'g'), v);};
String.prototype.trim = function() { return this.replace(/^\s+/g,"").replace(/\s+$/g,""); };

helpers.randomString = function(len, charSet) {
  charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  var randomString = '';
  for (var i = 0; i < len; i++) {
    var randomPoz = Math.floor(Math.random() * charSet.length);
    randomString += charSet.substring(randomPoz,randomPoz+1);
  return randomString;
};
...

String.randomString = function {
    "use strict";
    charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var randomString = '';
    for (var i = 0; i < len; i++) {
        var randomPoz = Math.floor(Math.random() * charSet.length);
        randomString += charSet.substring(randomPoz, randomPoz + 1);
    return randomString;
...

function randomString ( length ) {
  var seed = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  var name = "";
  for ( var i = 0; i < length; i++ ) {
    name += seed.charAt( Math.floor( Math.random() * seed.length ) );
  return name;

String.prototype.randomString = function(stringLength) {
  var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
  if (!stringLength>0) {
    var stringLength = 8;
  var randomString = '';
  for (var i=0; i<stringLength; i++) {
    var rnum = Math.floor(Math.random() * chars.length);
    randomString += chars.substring(rnum,rnum+1);
...