Reminds me of an algorithms professor who'd get us to implement some modified standard algorithm in Java and then go over each implementation really quickly at

Reminds me of an algorithms professor who'd get us to implement some modified standard algorithm in Java and then go over each implementation really quickly at the beginning of the next lecture. He'd find parts of your code weird, replace them really quickly and leave your clean, working implementation with 20 deprecation warnings. At the end of the day both solutions/syntaxes work, but..