[laughfactory]

Uh, yeah, that's some bullshit, buddy. You know what we're doing? Constructing and testing our code! A lot of those collaborative editors lack the ability to run code, which makes them only good for displaying final results. Plus, we all have editors we're familiar and productive using, why wouldn't we use what works for us? Plus, copying and pasting in from Stack Overflow is an issue? Come ON, buddy, that's just a sign of a good developer. A good developer does as little reinventing of the wheel as possible. If you want to make things more challenging then just increase the difficulty level of your questions so that more Stack Overflow code will need to be found and cobbled together. But yeah, if I got shit for not literally typing live into the crappy cooperative code editor, I'd politely thank you for the opportunity and end the interview. Senior-level people don't have a lot of patience for that kind of crap, particularly the truly good senior people.