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have you ever wondered how undo and redo is implemented in applications letamp;#39;s look at an algorithm for that itamp;#39;s quite simple letamp;#39;s draw this out with ascii art hereamp;#39;s the timeline it goes forward and letamp;#39;s draw the state changes in an application state change is one of add edit delete operations here are some state changes on the timeline now as you can probably guess from here when you undo we go back to the previous state when you redo we go forward in the list so naturally the data structure we should use is a linked list now letamp;#39;s drill down a bit more we want to save state just before the change happens letamp;#39;s mark it on the timeline letamp;#39;s write down what we know so far save state from fresh has these steps serialize the state add to the change set list increment the index letamp;#39;s visualize the index in our timeline as well and now letamp;#39;s look at undo imagine we want to undo at this point what this means
