title: How to convert an array of objects to array?
body: <p>Hi I am having an array of objects like this </p>
  
  <pre><code>  [{"$value":"Cardiology","$id":"0","$priority":null},                                                 
    {"$value":"Dermatology","$id":"1","$priority":null},
    {"$value":"Physiology","$id":"2","$priority":null},{"$value":"Child   
    Physiology","$id":"3","$priority":null}] 
  </code></pre>
  
  <p>I would like to convert this into </p>
  
  <pre><code>   ['Cardiology','Dermatology','Physiology','Child Physiology']
  </code></pre>
  
  <p>any help will be appreciated. </p>