The cool Swift features that you should not (ab)use

As an iOS developer, I used to work on a lot of legacy code, or I tried some Swift features myself. After using them or seeing some of them abused, I wanted to share my top 6 Swift language features that we should at least use carefully, and why not, banish them from your team? Let’s have an overview. You disagree or have other examples, please share them in the comments 💬.