Instafeed.js - Wrap every 4th item with a tag

instafeed_wrap_fourth.js

var count = 0;

var feed = new Instafeed({
  filter: function(image) {
    count += 1;
    if (count % 4 === 0) {
      image.customTagOpen = '<div>';
      image.customTagClose = '</div>';
    } else {
      image.customTagOpen = '';
      image.customTagClose = '';
    }
    return true;
  },
  template: '{{model.customTagOpen}}<img src="{{image}} />{{model.customTagClose}}';
});
feed.run();