Interesting, and useful in an interview for discerning Javascript aptitude, are two entirely separate things. Nobody would know this off the top of their head without digging. You (nor I) didn't even know, somebody else had to point out why. Better to stick to converting strings to numbers and such, to weed out the ones who have absolutely no idea how to do the simple things, rather than trying to find ones who know incredibly esoteric stuff. Once you've weeded out the truly awful, try to find who's intermediate and who's advanced, by asking PRACTICAL intermediate/advanced questions, not patently esoteric stuff.
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Interesting, and useful in an interview for discerning Javascript aptitude, are two entirely separate things. Nobody would know this off the top of their head without digging. You (nor I) didn't even know, somebody else had to point out why. Better to stick to converting strings to numbers and such, to weed out the ones who have absolutely no idea how to do the simple things, rather than trying to find ones who know incredibly esoteric stuff. Once you've weeded out the truly awful, try to find who's intermediate and who's advanced, by asking PRACTICAL intermediate/advanced questions, not patently esoteric stuff.