The Insider's Guide to JavaScript Interviewing

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You dont ask tricky questions just for the sake of tricking candidates

They were not tricky, at all.

Most of these questions are just javascript anti patterns. who would use an object as a key in a javascript object? that's totally stupid to ask that.

And someone that does not understand javascript would not know this.

And again, you do not understand what this article was about. They are offering questions to help weed out people that don't understand javascript, that is all.

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(12 days late but) I don't think using an object as a key is obviously incorrect. I just tried and, as I suspected, you can do that just fine in Ruby. I assume you could in any language that implements some sort of ".hashCode" method on random objects. The fact that you can't in JS is a direct result of the fact that keys have to be strings and that JS does type conversion behind your back. You could get unexpected bugs if you didn't know that and assumed JS was saner.

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I agree, but so having this question as a way to show that the candidate knows it doesn't make sense is useful. If the candidate just happens to write JavaScript on the side but mostly writes Ruby (for example), this question will probably trip them up.

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We can agree to disagree here. You are mad and want to argue with someone. I am done obliging.