Meta Software Developer interview questions

1st round interview. The following round would have 3 interviews. The interviewer was calm and helpful throughout the process. So no complaints in that department. Asked 2 questions in the first round one of them being the one I mentioned bellow. I did not have a OA.

It was fine and I thought the interview questions were not terribly hard but the practice assignment was and it was awkward having the interviewer there. I would advise against this next time.