How to write the perfect function

For humans, by humans. But honestly, his suggestions are really good. Try them out in your job.

code
engineering

No tl;dr, just watch: https://m.youtube.com/watch?v=2OMRWPOSw9s

A question for yourself after you finished watching it:
What type of function have you always written - honest or dishonest? And will you change it?