Nodejs Utililty Methods Array Find

Array.prototype.find = function( func) {
  if( $.isFunction(func) ) {
    for( var i=0; i<this.length; i++ ) {
      var item = this[i];
      if( func(item) == true ) {
        return item;
    return null;
...

Array.prototype.find = function() {
  if(arguments.length === 0) {
    return CollectionInspect(this);
};

Array.prototype.find = function()
  var result;
    this.each(function(value, index)
    if(iterator.call(context, value, index, this))
      result = value;
      return false;
...

Array.prototype.find = function(callback) {
   for (var i = 0; i < this.length; i++) {
      if (callback(this[i])) return this[i];
   return undefined;

'use strict';
Array.prototype.find = Array.prototype.find || function(callback) {
  if (this === null) {
    throw new TypeError('Array.prototype.find called on null or undefined');
  } else if (typeof callback !== 'function') {
    throw new TypeError('callback must be a function');
  var list = Object(this);
  var length = list.length >>> 0;
...

Array.prototype.find = function(cond) {
  for(var i = 0, n = this.length; i < n; ++i) {
    if(cond(this[i])) {
      return this[i];
  return null;
};

Array.prototype.find = function(criteria) {
  for (var i = 0; i < this.length; i++) {
    if (criteria(this[i])) {
      return this[i]
  return null

Array.prototype.find = function(criteria) {
  for (var i = 0; i < this.length; i++) {
    if (criteria(this[i])) {
      return this[i]
  return null
Math.sign = function(x) {
...

Array.prototype.find = function (element) {
  if (typeof element === 'function') {
    return element(this);
  var len = this.length;
  for (var i = 0; i < len; i++) {
    if(this[i] === element) {
      return element;
  return -1;
var doPow = function (array) {
  var len = array.length;
  for(var i = 0; i < len; i++) {
    array[i] *= array[i]; 
  return array;
var b = [1, 2, 3, 4, 5, 6];
console.log(b.find(doPow));

Array.prototype.find = function(element) {
    var i;
    for (i = 0; i < this.length; i += 1) {
        if (this[i] === element) {
            return i;
    return false;