Building applications that are clean and have small memory footprint is a necessity for iOS development. If you have a lot of retain cycles or memory related issues, there's a good chance that you'll experience either early terminations or unexpected behavior with your code. To solve these problems, I'll first show you how to identify issues by overriding <b>deinit</b>. Then we'll look at removing the firebase snapshot retain cycle, as well as other problems. Enjoy.