Did you get visibly pissed off with the question? That might be why the interview went poorly. Whenever I get pop quiz questions, I just say I don't remember an

Did you get visibly pissed off with the question? That might be why the interview went poorly. Whenever I get pop quiz questions, I just say I don't remember and if it came up in a real codebase I would test it in a REPL to see what it does. The interview carries on normally after that in my experience.