title: How to sort a Map by its value in dart?
body: <p>I want to sort a <code>Map&lt;String,int&gt;</code> by values.</p>
  
  <pre><code>{'201': 4, '2017CS197': 2, '2017CS300': 6, '202': 4, '205': 3, '206': 3, '207': 5}
  </code></pre>
  
  <p>this is my map.</p>
  
  <p>after i want to get result as {'2017CS300': 6,'207':5,'202':4,'201':4,'206':3,'205':3,'2017CS197':2}</p>
  
  <p>Thank You!</p>