Should I use a Swift struct or a class? · faq.saSwift has rich value types, which is a new experience for many software developers. This has opened the door for the functionalists to ride in. What I call "functionalism" is really the philosophy of [functional programming](https://en.wikipedia.org/wiki/Functional_programming), which is in fact a very old idea. The idea is that a lot of bugs in programming today are due to having the wrong *state
