21
How Long Should a Function Be? (And Why It’s the Wrong Question to Ask)
(adamtornhill.substack.com)
this post was submitted on 29 Apr 2026
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Programming
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42 or 69
Depends on the function. Scientific functions should be 42 long, and for a couple of functions it should be 69. I don't make the rules here.
I've heard the younger generation tends to prefer 21 or 67 long functions instead.