Have you stopped to consider that given the pressure situation of an interview at a well respected company, and without the common resources a programmer genera

Have you stopped to consider that given the pressure situation of an interview at a well respected company, and without the common resources a programmer generally works with (an IDE and reference documentation), that a person might have trouble with this despite understanding how it works? It seems like you should be asking 'Write me something to do X, using Y from the standard library' and evaluating that code, if you're looking to evaluate how well someone knows a library function.