Nodejs Utililty Methods Array Contain

Array.prototype.contains = function(obj) {
    if(!obj) return false;
    var i = this.length;
    while (i--) {
        if (this[i].trim().toLowerCase() === obj.trim().toLowerCase()) {
            return true;
    return false;
...

Array.prototype.contains = function(obj) {
  var _reg = 0, t = this, i = t.length;
  while(i--) { 
    if(t[i] === obj) {
      _reg++;
return _reg;
};
...

Array.prototype.contains = function(obj) {
  for ( var i = 0, len = this.length; i < len; i++) {
    if (angular.equals(this[i], obj))
      return true;
  return false;
};

Array.prototype.contains=function(obj){
  return (this.indexOf(obj)>=0);

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

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

Array.prototype.contains = function(obj){
  var i = this.length
  while(i--){
    if(self[i] == obj){
      return true
  return false

Array.prototype.contains = function(obj){
  return (this.indexOf(obj) == -1)?false:true;
if(!Array.indexOf){
  Array.prototype.indexOf = function(obj){
    for(var i=0; i<this.length; i++){
      if(this[i]==obj) return i;
    return -1;
...

Array.prototype.contains = function(obj)
    return (this.indexOf(obj) > -1);

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