Btilly is entirely correct of course, but there is a huge caveat to what he says. That being that people who want to cheat have any number of ways of doing it

Btilly is entirely correct of course, but there is a huge caveat to what he says. That being that people who want to cheat have any number of ways of doing it from finding someone else who posted it publicly, to asking privately, to (in the extreme case) actually paying someone to figure out the answer and give it to them. And, as I mentioned in a previous post, the people who do not want to cheat, won't. They won't do those searches. If they stumble over it and know what it is they won't read it. If they stumble over it and read it before they know what it is, they will almost certainly forget the details quickly. So by posting your Arc code publicly, you would neither (significantly) help someone wanting to cheat nor hurt someone not wanting to cheat. But you will help people who want to learn Arc.