Comment by alkonaut

If I'm interviewing for people to work in some specific tech stack or business, it's just as good to see completely different things they can show. Could be a php site for their book club or whatever. But the key is to have some code to discuss that is their code. Because I want to see them describe and reason about code they know, and it works 10x better if it's code they know, rather than some code I present and say "here, let's reason about this code".