Practical Usecases

We've already seen a couple of useful enums in the previous feature descriptions. Examples would be Optional, Either, FileNode, or the binary tree. However, there're many more scenarios where using an enum wins over a struct or class. Usually, if your problem domain can be divided into a finite set of distinctive categories, an enum may be the right choice. Even only two cases are a perfectly valid scenario for an enum, as the Optional and Either types show.

Here, then, are some more examples of practical enum usage to fuel your creativity.