Nodejs Utililty Methods Array Contain

Array.prototype.contains = function(obj, firm) {
  firm = firm === true ? true : false;
  var i = this.length;
  while (i--) {
    if ((!firm && this[i] == obj) || this[i] === obj) {
      return true;
  return false;
...

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

Array.prototype.contains = function(object) {
  if (this.indexOf(object) !== -1) {
    return true;
  return false;
};

Array.prototype.contains = function(oneItem)
  var index = dojo.indexOf(this, oneItem);
  return index != -1;

Array.prototype.contains = function (query)
  function compare(element) 
    return element === query;
  return this.some(compare);
};

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

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

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

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

Array.prototype.contains = function (target, ordered) {
    ordered = ordered || false;
    var foundAll = true;
    if (ordered) {
        var lastIdx = -1;
        for (var i = 0; i <= target.length - 1; i++) {
            lastIdx = this.indexOf(target[i], lastIdx + 1);
            if (lastIdx == -1) {
                foundAll = false;
...