Nodejs Utililty Methods Array Contain

Array.prototype.contains = function (item, from) {
    return this.indexOf(item, from) !== -1;
};

Array.prototype.contains = function(item, from){
  return this.indexOf(item, from) != -1;

Array.prototype.contains = function (k) {
    'use strict';
    var p;
    for (p in this) {
        if (this.hasOwnProperty(p) && this[p] === k) {
            return true;
    return false;
...

function my_max(arr){
    var max = arr[0];
    for (var i = 0; i < arr.length; i++){
        if (arr[i] > max){
            max = arr[i];
    return max;
};
...

Array.prototype.contains = function(key, array){
  var toReturn = false
  $.each(this, function(i, object){
    if(array.indexOf(object[key]) > -1){
      toReturn = true
      return false
  })
  return toReturn
...

Array.prototype.contains = function(key, value) {
    var i = this.length;
    while (i--) {
        if (this[i][key] === value){
            return true;
    return false;

Array.prototype.contains = function(mxd,strict) {
    for(i in this) {
    if(this[i] == mxd && !strict) return true;
      else if(this[i] === mxd) return true;
    return false;

Array.prototype.contains = function(n) {
  return this.indexOf(n) !== undefined;
};

Array.prototype.contains = function(needle) {
  return this.indexOf(needle) !== -1;
};

Array.prototype.contains = function(o) {
  for (var i = 0; i < this.length; i++) {
    if (this[i] == o) {
      return true;
  return false;