> Is "for i in 1:length(A)" ever correct? In some rare cases, it very well might be exactly what the code's author intended and needed. I tend to lean towards

> Is "for i in 1:length(A)" ever correct? In some rare cases, it very well might be exactly what the code's author intended and needed. I tend to lean towards when Martin Fowler calls an "enabling attitude"[0] (as opposed to a "directing attitude") -- that is, when faced with a choice about how to design the primitives of an interface, I lean more often towards providing flexibility, and I try to avoid choosing ahead of time what users aren't allowed to do. It's better to document what's usually the wrong way to do something than to enforce it in the design. You can never guess what amazing things people will create when they are given flexible, unrestricted primitives. So for cases like this, I think it's better to rely on a flexible linting tool (if available) than warnings or errors. [0] https://martinfowler.com/bliki/SoftwareDevelopmentAttitude.html https://martinfowler.com/bliki/SoftwareDevelopmentAttitude.h...