title: What does .files[0] represent in javascript/jQuery?
body: <p>So when uploading an image via ajax and I come across something like this:</p>
  
  <pre><code>$("input#uploadedfile").on("change", function(){
     var file = this.files[0],
  });
  </code></pre>
  
  <p>Assume #uploadedfile is a <code>file</code> type input, is <code>this.files[0]</code> just targeting the first file uploaded? Also is this jQuery doing the exact same thing?:</p>
  
  <pre><code>var file = $(this).get(0).files[0]
  </code></pre>