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I recently came across the need for undo and redo functionality in my app.
The app is an editor of sorts that allows you to add stuff and remove stuff...
You've probably seen a button like this one before:
One that has options:
<Button secondary>Secondary Cool...
If you're a computer scientist or follow @davidkpiano you've probably heard about state machines.
They are awesome.
Here's an example of how to use...