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> recursion is extremely rare in shipped code but extremely common in interviews

Though not quite important to the main theme of the article, I wonder what area the author is referring to.

I guess to all the whiteboard coding with the recursion (e.g. Fibonacci sequence). On a contrary, I think it is present in many places where you have to dive into any sensible, tree like, structure. Then, it's a mess once it turns out person has no idea what recursion is.

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