No doubt you know how to do it; but when you play with this sort of problem as a kid, and you haven't been shown the answer... it's fun trying to figure out how to do it. Then, as you go into adulthood, you develop a certain confidence that you can discover things; but if they've already been discovered, that shouldn't bother you at all. What one fool can do, so can another, and the fact that some other fool beat you to it shouldn't disturb you: you should get a kick out of having discovered something.
– Richard Feynman, "Feynman Lectures on Computation", via Satyajit Ranjeev at https://satran.in/Implementing tail's follow in Go/