In this article I will show you how to achieve a strong compile-time guarantee that your code is correct. I will demonstrate how the internal structure of your types can hold unbreakable rules within them, known as invariants. Through real-world examples such as `NonEmptyArray`, `Zipper`, and `UUID`, I'll try to convince you to view the structure of your types through the lens of type safety, ultimately levelling up your Swift programming skills.
