about tech interviews, the way you handle stuff you dont know is also important. I didn't say he deserved to be rejected because he didn't know what summing 2 arrays results in, but the interviewer was fair to ask that (if the position was about javascript). and yes if you were the interviewee with this kind of attitude I'd reject you on the spot
Of course it's fair and by the rules - at least technically. It's the practicality of it that is questionable. But you have to experience the hot seat yourself and get thrown at tons of tricky and obscure things one interview after the other in order to understand that frustration.
about tech interviews, the way you handle stuff you dont know is also important. I didn't say he deserved to be rejected because he didn't know what summing 2 arrays results in, but the interviewer was fair to ask that (if the position was about javascript). and yes if you were the interviewee with this kind of attitude I'd reject you on the spot