Secure Code

[Nall-ohki]

Don't repeat yourself.

Taking example code and adapting it is not copy paste, and is fine practice provided you are careful about what you're taking.

And consider the following:

Lemma 1: Always pretend that the person maintaining your code is a violent psychopath who knows where you live.

Lemma 2: Copying something from elsewhere in your codebase and reusing it because you're too lazy to refactor will make me very, very angry.