Nodejs Utililty Methods Array Contain

Array.prototype.contains = function(item){
    return RegExp("(^|,)" + item.toString() + "($|,)").test(this);
};

Array.prototype.contains = function (item) {
  return RegExp("\\b"+item+"\\b").test(this);
};

Array.prototype.contains = function(item) {
    if (typeof(item) === 'function') {
        return this.some(item);
    return this.indexOf(item) >= 0;
};

Array.prototype.contains = function(item) {
  return this.indexOf(item) === -1 ? false : true

Array.prototype.contains = function (item) {
    for (i in this) {
        if (this[i] === item) {
            return true;
    return false;
};

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

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

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

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

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