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have you ever wondered how undo and redo is implemented in applications lets look at an algorithm for that its quite simple lets draw this out with ascii art heres the timeline it goes forward and lets 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 lets drill down a bit more we want to save state just before the change happens lets mark it on the timeline lets 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 lets visualize the index in our timeline as well and now lets look at undo imagine we want to undo at this point what this means is we want to get to the previous state here the index should be decremented now
