javascript - Reverse sort order with Backbone.js

Question

With Backbone.js I've got a collection set up with a comparator function. It's nicely sorting the models, but I'd like to reverse the order.

How can I sort the models in descending order rather than ascending?

Answer 1

Well, you can return negative values from comparator. If we take, for example, the example from Backbone's site and want to reverse the order, it will look like this:

var Chapter  = Backbone.Model;
var chapters = new Backbone.Collection;

chapters.comparator = function(chapter) {
  return -chapter.get("page"); // Note the minus!
};

chapters.add(new Chapter({page: 9, title: "The End"}));
chapters.add(new Chapter({page: 5, title: "The Middle"}));
chapters.add(new Chapter({page: 1, title: "The Beginning"}));

alert(chapters.pluck('title'));