How to get the value of a form serializeArray?

I have a serializeArray in my form to send the data via post with ajax, but I wanted to get a data that is in a hidden field in the form to use before the post, in the same javascript, how can I recover?

    // setup some local variables
  var $form = $(this);
  // Let's select and cache all the fields
  var $inputs = $form.find("input, select, button, textarea");
  // Serialize the data in the form
  var serializedData = $form.serializeArray();

// Atualmente faço assim     
  // 
  var codigo = "";
  if($('#code').val()){
    codigo = $("#code").val();