Only if the knowledge is essential, then it makes sense. but I don't think so in this problem. That's very bad since these kind of test wastes developer's time. I can't find any point of this question. Probably, it would be better if the developer can ask himself when he is not sure. If he is not, then he will check reference.
An interviewer can tell a lot about the candidate when they're presented with the question they're unfamiliar with.
Will they immediately tell you they don't know and try to use logic and a set of possible outcomes?
Will they try to blindly guess the result?
Will they just collapse and try to tell you don't anything about a proper interview?
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Tests a certain knowledge (JS in this case) doesn't exclude questions related to problem solving.
For a skilled candidate it's equally important to have both.
Only if the knowledge is essential, then it makes sense. but I don't think so in this problem. That's very bad since these kind of test wastes developer's time. I can't find any point of this question. Probably, it would be better if the developer can ask himself when he is not sure. If he is not, then he will check reference.
An interviewer can tell a lot about the candidate when they're presented with the question they're unfamiliar with.
Will they immediately tell you they don't know and try to use logic and a set of possible outcomes?
Will they try to blindly guess the result?
Will they just collapse and try to tell you don't anything about a proper interview?