title: How to sort map value?
body: <p>I have this map:</p>
  
  <pre><code>var temp= { 
    'A' : 3,
    'B' : 1,
    'C' : 2
  };
  </code></pre>
  
  <p>How to sort the values of the map (descending). I know, I can use temp.values.toList()..sort().</p>
  
  <p>But I want to sort in context of the keys like this:</p>
  
  <pre><code>var temp= { 
    'B' : 1,
    'C' : 2
    'A' : 3,
  };
  </code></pre>