I usually have a buffer that is kind of like a Jupyter notebook, and it accumulates a lot of stuff that may or may not turn out to be useful in the end. If I'm

I usually have a buffer that is kind of like a Jupyter notebook, and it accumulates a lot of stuff that may or may not turn out to be useful in the end. If I'm doing the work to keep things tidy as I go, so it's close to production ready at the end, then it isn't much different from traditional programming. It ends up just being TDD in one file instead of two.