filter impressions from datalayter

gistfile1.txt

dataLayer = dataLayer.filter (function (el) {
  /* Clean up datalayer so there are not multiple impressions objects */
  if (el.ecommerce) {
    return !el.ecommerce.impressions;
  } else {
    return el;
  }

});

You don't need the else:

dataLayer = dataLayer.filter (function (el) {
  /* Clean up datalayer so there are not multiple impressions objects */
  if (el.ecommerce) {
    return !el.ecommerce.impressions;
  }
  return el;
});