$(function () {
  // Create a model class.
  const TodoItem = Backbone.Model.extend({});
  // Create a model instance.
  const todoItem = new TodoItem({
    description: "Remember the milk",
    status: "incomplete",
    id: 1,
  });

  // Manipulate attributes.
  const description = todoItem.get('description');
  todoItem.set('status', 'complete');

  // Save to the server: needs some configuration.
  // todoItem.save();

  // Create a view class.
  const TodoView = Backbone.View.extend({
    render: function () {
      const html = '<h3>' + this.model.get('description') + '</h3>';
      $(this.el).html(html);
    },
  });
  // Create a view instance.
  const todoView = new TodoView({ model: todoItem });
  todoView.render();
  $('#app').html(todoView.el);
});