text: 'use strict';
  
  const LinkedList = require('./linked-list');
  
  // list !== linked list
  
  const linkedList = new LinkedList();
  
  linkedList.append(10);
  linkedList.append(20);
  linkedList.append(30);
  linkedList.append(62);
  
  linkedList.insertBefore(10,1);
  linkedList.insertAfter(20,2);
  
  linkedList.valueAtK(2);
  
  
  linkedList.traverse();
  
  
  
  