title: Dart - How to sort Map's keys
body: <p>I have question in sorting Map's key in Dart. </p>
  
  <pre class="lang-dart prettyprint-override"><code>Map&lt;String, Object&gt; map = new Map();
  </code></pre>
  
  <p>How can I sort the keys in map? or Sort the Iterable map.keys.</p>