code: public Node lastChild() {
  
  		if (currentNode == null)
  			return null;
  
  		Node node = getLastChild(currentNode);
  
  		if (node != null)
  			currentNode = node;
  
  		return node;
  	}
docs: Return the last child Node from the current node, after applying filter,
  whatToshow. If result is not null, set the current Node.