JavaScript Data Structers - Linked List with reversed method

LinkList-with-Reversed.js

function LinkedList() {
  this.head = null;
  this.tail = null;
}
 
function Node(value, next, prev) {
  this.value = value;
  this.next = next;
  this.prev = prev;
}
 
LinkedList.prototype.addToHead = function(value) {
  var newNode = new Node(value, this.head, null);
  if (this.head) this.head.prev = newNode;
  else this.tail = newNode;
  this.head = newNode;
};
 
LinkedList.prototype.addToTail = function(value) {
  var newNode = new Node(value, null, this.tail);
  if (this.tail) this.tail.next = newNode;
  else this.head = newNode;
  this.tail = newNode;
};
 
LinkedList.prototype.removeHead = function() {
  if (!this.head) return null;
  var val = this.head.value;
  this.head = this.head.next;
  if (this.head) this.head.prev = null;
  else this.tail = null;
  return val;
};
 
LinkedList.prototype.removeTail = function() {
  if (!this.tail) return null;
  var val = this.tail.value;
  this.tail = this.tail.prev;
  if (this.tail) this.tail.next = null;
  else this.head = null;
  return val;
};
 
LinkedList.prototype.search = function(searchValue) {
  var currentNode = this.head;
  while (currentNode) {
    if (currentNode.value === searchValue) return currentNode.value;
    currentNode = currentNode.next;
  } 
  return null;
};
 
LinkedList.prototype.indexOf = function(value) {
  var indexes = [];
  var currentIndex = 0;
  var currentNode = this.head;
  while(currentNode) {
    if (currentNode.value === value) indexes.push(currentIndex);
    currentNode = currentNode.next;
    currentIndex++;
  }
  return indexes;
};
 
var myLL = new LinkedList();
 
myLL.addToHead(123);
myLL.addToHead(70);
myLL.addToHead('hello');
myLL.addToTail(19);
myLL.addToTail('world');








LinkedList.prototype.reversed = function(){
    var LinkedListReversed = new LinkedList();
    var currentNode = this.head;
  while (currentNode) {
    
    LinkedListReversed.addToHead(currentNode.value);
    currentNode = currentNode.next;
    
  } 
  return LinkedListReversed;
}



console.log(myLL);
console.log('----------------------------------------');
console.log(myLL.reversed());