Off the top of my head, it was edge cases of code to process in your head and write down the exact result the computer would output. Things like “what is the result of 1 + ‘1’”. And of course there was some kind of “protection” to keep you from copy pasting the code into the console which can be circumvented a number of ways. Too bad that wasn’t part of the test, it would actually be a better signal than their trivia questions.