title: jquery function (a,b) need explanation
body: <p>I found this codesnipe and I do not understand where the a and b is given.
  It works, so it may be $window. What is jquery here doing?</p>
  
  <pre><code>function (a, b) {
      var c = a('meta[name="csrf-token"]').attr("content");
  }(jQuery)
  </code></pre>
  
  <p>the html:</p>
  
  <pre><code>  &lt;meta content="authenticity_token" name="csrf-param" /&gt;
  &lt;meta content="/Zsc0Ma07P8gupCp2k3Iu77nTOQDStpt6bToOlVt/gc=" name="csrf-token" /&gt;
  </code></pre>