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Hi, Iamp;#39;m Oliver and Iamp;#39;m the creator of Backbone.Undo.js and Iamp;#39;m gonna show you how it works and whatamp;#39;s so cool about it. Backbone.Undo.js is a very simple undo manager for Backbone.js. And the cool thing is that you donamp;#39;t really have to change your app usually at all [to make it work] and you just need a few lines of code and youamp;#39;re done. So, how does that work? The principle of Backbone.Undo.js is that you register the objects whose changes you want to undo and redo and the undo manager then observes these objects and listens to the events they trigger. On every event it creates a before- and after-state and stores it internally as an amp;quot;UndoActionamp;quot; in an amp;quot;UndoStackamp;quot;. So, this is how Backbone.Undo.js works and as you can see the major advantage is that it makes extensive use of Backboneamp;#39;s own mechanisms so, events, functions like previousAttributes() to get the before-state, etc. and that way
