> But if you're given the definitions and a couple minutes to figure it out (which, in an interview, you are), and you actually can't come up with the 10 lines of code to do it, maybe that question is working as intended after all...

or maybe the person struggles to work things out in an extremely stressful situation

I speak as somebody that finds interviews Extremely stressful and if working there is regularly my interview levels of stress then please do reject me.