In a parallel universe, a candidate who is worried about a divisor of zero has his head stuck in the tiny details and is unable to do big-picture thinking. Personally I've gone my entire career without seeing a divide-by-zero bug. It's the last thing on my mind. If it's possible for Z to be zero, it will be caught in CI before we deploy/cut a release.
In your first snippet, would you expect a candidate to tell you that `f` might be undefined?
In your first snippet, would you expect a candidate to tell you that `f` might be undefined?