JAVASCRIPT

Node temp = new Node(6, head, head.getNext()); head.setNext(temp); temp.getNext().setPrev(temp); Node temp1 = tail.getPrev(); tail.setPrev(temp1.getPrev()); temp1.getPrev().setNext(tail);

	Node temp = new Node(6,head,head.getNext());
	Node temp1 = new Node(2,tail.getPrev(),tail);
	head.setNext(temp);
	temp.getNext().setPrev(temp);
	tail.setPrev(temp1);
	temp1.getPrev().setNext(temp1);