title: Google maps setMap() and map options
body: <p>I am new to Google maps api v3.
  In the Google maps official tutorial, some of the sample code using</p>
  
  <pre><code>new google.maps.Marker({
   map: map    //Map option
  });
  </code></pre>
  
  <p>or</p>
  
  <pre><code>new google.maps.Marker({
   //some options here
  }).setMap(map);
  </code></pre>
  
  <p>What are the difference between each other?</p>