When designing applications focused on the creation or modification of data, like text or image editors, for example, a common desire for your end-user is the ability to undo or redo their actions. It’s an important consideration, because the knowledge that steps can be safely and easily undone gives your users confidence in using your app.

So, you’ve decided to try integrating an undo system into your project, but you’ve never written anything like that before. How do they work? Where do you even start? …

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