This is why I have always been terrified of having to do a standard 'whiteboard' coding interview, and really don't want to ever participate in administering them to others. I know if I was ever tested in this way, I would be unable to remember the basic function names in languages I have used daily for years... and yet I have developed sophisticated software tools in these languages with a large global userbase. I fear that in an interview people would decide I am a fraud, and couldn't have really done what I have done when it appears I actually don't even remember the basics. But my mind just doesn't work that way, I can't remember length vs size either, even if I can design a complex algorithm, and turn it into a good piece of software under the actual conditions of work in the real world.