I think that's kind of the point.

If you have to study for an interview, the interview is most likely not representative of real work one would find on the job.

Let's face it. "Big Co" interviewing is about passing an arbitrary bar that they have set. It's not representative of the actual work post hire.

Funny, because whenever I get asked questions like that, I just start nesting for loops to an arbitrary depth, until that trolls my way out of the interview.

Then I wrap the outer-most closure in an exception that swallows the error, and bid good afternoon.