Most used functions in Racket code: http://t.co/RPmTA6C0O8 (always interesting when you can get quantitative data)
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It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!
Go has an elegant approach to defining example functions, which are shown in docs as `main()` with the output: https://go.dev/blog/examples
Over a sufficiently long time horizon, all code you write is legacy code.