title: Coffeescript's Q.defer() then's call back
body: <p>I've seen </p>
  
  <pre><code>defereed.then (arg) =&gt;
      function body
  </code></pre>
  
  <p>And </p>
  
  <pre><code>deferred.then ( 
      (arg) =&gt;
          function  body
  )
  </code></pre>
  
  <p>Can someone explain the difference? </p>
  
  <p>This is from  <a href="https://github.com/gwomacks/php-debug/blob/master/lib/engines/dbgp/dbgp-instance.coffee" rel="nofollow">https://github.com/gwomacks/php-debug/blob/master/lib/engines/dbgp/dbgp-instance.coffee</a></p>