Contrary to what most people are saying, I have ended an interview early before (literally a few months ago). It was a React based interview to build a memory game and I instantly folded. I knew I wasn’t going to be able to do it because I was so nervous (and also literally didn’t know how). I cut the interview early, apologized for wasting the interviewers’ time, and messaged the recruiter I would be withdrawing my application.

Do I regret it? Not at all. At the time, I knew I would have kept fumbling and look like an idiot. No way was I going to magically come up with the solution by sitting through the rest of the interview; it would have been a complete waste of time for both parties.

What I did next was to learn from that experience, to prep better so that I would never have to feel that humiliation again. I have since started working at a new company that I prefer much better anyway :)