Nodejs Utililty Methods Array Random

Array.prototype.random = function() {
  return this[ Math.floor(Math.random() * this.length) ];
};

Array.prototype.random = function () {
  return this[Math.floor((Math.random()*this.length))];

Array.prototype.random = function() {
  return this[Math.floor((this.length-1)*Math.random())];
};

function XHR(method, path, data, callback) {
  var xhr = new XMLHttpRequest();
  xhr.open(method, path, true);
  xhr.onreadystatechange = function() {
    if (xhr.readyState != 4) return;
    callback(xhr.status, xhr.responseText);
  xhr.send(data);
function getPos(obj) {
  var curleft = 0, curtop = 0;
  if (obj.offsetParent)
    do {
      curleft += obj.offsetLeft;
      curtop += obj.offsetTop;
    } while (obj = obj.offsetParent);
  return {x: curleft, y: curtop};
function toRangeOrMiddle(a, x ,b) {
  if (b < a) return (a+b)/2;
  if (x < a) return a;
  if (x > b) return b;
  return x;
Array.prototype.random = function() {
  return this[Math.random()*this.length|0];
window.onerror = function(errorMsg, url, lineNumber) {
  var msg = "Error happened on <"+url+
    "\n> on line "+lineNumber+":\n"+
    errorMsg;
  console.log(msg);

Math.randomInt = function (min, max) {
    return Math.round(Math.random() * (max - min) + min);
};
Array.prototype.random = function () {
    this[Math.randomInt(0, this.length-1)];

Array.prototype.random = function () { return (this[(Math.max(Math.random() * this.length - 1, 0).toFixed())]) } 
Array.prototype.fillNull = function(){this[].fill(function(){return null})}
Array.prototype.bool = function () { return this.map(function (v) { return v ? true : false }) } 
Array.prototype.a01 = function () { return this.map(function (v) { return v ? 1 : 0 }) }
Array.prototype.splitToChunks = function (num) {
  var ret = []
  for (var i = 0; i < this.length / num; i++) {
    ret.push(this.slice(i * num, i * num + num))
  return ret
Array.prototype.removeByIndex = function (index) {
  return this.splice(index, 1)
Math.myRandom = function (max, min) {
  if(max == undefined) return Math.random()
  if(min == undefined) return Math.random() * max;
  return Math.random() * (max+-min) + min;

Array.prototype.random = function () {
  var i, j, k, ti, tj;
  for (k = 0; k < this.length; k++) {
    i = this.length;
    while (--i) {
      j = Math.floor(Math.random() * (i - 1));
      ti = this[i];
      tj = this[j];
      this[j] = ti;
...

window.console = window.console || {'log':function(){}}
function randomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
Array.prototype.random = function () {
  return this[Math.random() * this.length - 1 | 0];
};
Array.prototype.subRandom = function () {
  var length = randomInt(0, this.length)
...

Array.prototype.random = function() {
  return this[Math.floor(Math.random() * this.length)];
Number.prototype.toPrice = function() {
  return this.valueOf().toFixed(2).replace(/./g, function(c, i, a) {
    return i && c !== "." && !((a.length - i) % 3) ? "," + c : c;
  });

Array.prototype.random = function(){
  return this[Math.round(Math.random()*(this.length-1))]