title: Angular2 access nested JSON
body: <p>i´m new to Angular 2 in Typescript.I want to access D and G of my JSON with NgFor. Is there a way to access the elements?</p>
  
  <pre><code>[
    {
     "A":"B",
     "C":{
        "D": ["E","F"],
        "G": ["H"]
   } 
  }
  </code></pre>
  
  <p>]</p>
  
  <p>I also createt a Plunker: <a href="https://plnkr.co/edit/QXcPqDI8SljFumEYs5Xq?p=preview" rel="nofollow">Plunker</a></p>