title: How to loop through an Immutable Map of Immutable Maps?
body: <p>I've got an immutable map of maps.</p>
  
  <pre><code>let mapOfMaps = Immutable.fromJS({
      'abc': {
           id: 1
           type: 'request'
      },
      'def': {
          id: 2
          type: 'response'
      },
      'ghi': {
          type: cancel'
      },
      'jkl': {
          type: 'edit'
      }
  });
  </code></pre>
  
  <p>How can I</p>
  
  <ol>
  <li>loop through mapOfMaps and get all the keys to print them out? </li>
  <li>loop through the keys of mapOfMaps to get all of the contents of the key?</li>
  </ol>
  
  <p>I don't have the option of switching to a List at this stage.</p>
  
  <p>I don't know how to loop through the keys.</p>