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I always write // XXX comments that mean there's something here I'm supposed to remember but I don't have the time to write it down right now. It's always fun going back over those and trying to reverse engineer what the hell I was thinking at the time.

Came here to say this - I almost never think much of the code I wrote. But when I see a moment in time that I took the care to do something for future me, it's almost the same as looking at an old photo of myself, and thinking, 'Hey, I didn't look half bad back then!"

I call writing these comments "being kind to my future self". It's easier to take the time to justify writing these when I think of doing my future self -- or the poor person who has to maintain my code -- a kindness.