title: JQuery: Turn array input values into a string optimization
body: <p>using jQuery I have the following code:</p>
  
  <pre><code>var selectedIdsArray = $("#selectId option:selected").map(function(){return this.value;});
  var selectedIdsStr = $.map(selectedIdsArray, function(val){ return "" + val + "";});
  </code></pre>
  
  <p>It successfully retrieves a string of ids eg. selectedIdsStr = "2,45,245,1" from an <code>&lt;select multiple='multiple'&gt;</code> element. I was wondering if there is a more efficient way (less code) to achieve this?</p>
  
  <p>Thanks!</p>