In my experience, interviewers who give whiteboard problems are not expecting perfect answers or even syntactically correct answers, although if the interviewer

In my experience, interviewers who give whiteboard problems are not expecting perfect answers or even syntactically correct answers, although if the interviewer sees a bug (e.g., missing some corner case), you may be prompted to look for it. The goal is to have a basis for follow-up questions like “how would you change it if the input was type Y instead of type X?” or “what’s the time/space complexity of that algorithm?” or “how would you write a test for that function?”