Why would Undo be any harder to add post-hoc than any other feature? Encapsulate... | Hacker News

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		ken on Dec 12, 2019 \| parent \| context \| favorite \| on: Things end users care about but programmers don't Why would Undo be any harder to add post-hoc than any other feature? Encapsulate each action, codify its opposite, and push it onto the undo stack.

mark-r on Dec 12, 2019 | [–]

"Encapsulate each action and codify its opposite" is exactly the hard part of this. Too much code is written assuming it has access to the entire state of whatever it's modifying and doesn't have to worry too much about side effects.

buckminster on Dec 12, 2019 | [–]

Most new features don't require changes to the logic of every existing feature.

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