title: how to print all values of a nested object
body: <p>There is a nested object like that:</p>
  
  <pre><code>var conversation = {
      'John': {
          1: 'Test message 1',
          2: 'Test message 2',
          'Reply': {
              3: 'Test message 3',
              4: 'Test message 4'
          }
      },
      'Jack': {
          5: 'Test message 5',
          6: 'Test message 6'
      }
  };
  </code></pre>
  
  <p>I need to get all final values, so for that example, it is:</p>
  
  <pre><code>Test message 1
  Test message 2
  Test message 3
  Test message 4
  Test message 5
  Test message 6
  </code></pre>
  
  <p>How to iterate over the object? Is there any built-in function in jQuery or JavaScript?</p>