title: How to get the first key (not value) of immutable.js map?
body: <p>How to get the first key (not value) of immutable.js map?</p>
  
  <p>basically  <code>myMap.first()</code> will return the value, but I am interested in the key...</p>
  
  <p>I can do a forEach and store first, but must be a better way!</p>
  
  <p>didn't see it in the docs, prob missing it... :/</p>
  
  <p>tx</p>
  
  <p>Sean</p>