Case in point

gistfile1.js

Handlebars.registerHelper('course_options', function (course_id) {
  str = "";
  
  _.each(courses.pluck("_id"), function (current_id) {
    str += "<option";
    if (current_id === course_id) {
      str += " selected";
    }
    str += ">" + courses.get(current_id).get('title') + "</option>\n";
  });

  return str;
});