Swift Functional Programming - Second Edition

Defining enumerations

In Swift, an enumeration defines a common type for related values and enables us to work with those values in a type-safe way. Values provided for each enumeration member can be a String, Character, Integer, or any floating-point type.

The following example presents a simple definition of an enum:

enum MLSTeam {     case montreal     case toronto     case newYork     case columbus     case losAngeles     case seattle } let theTeam = MLSTeam.montreal 

enum MLSTeam provides options for MLS teams. We can choose only one of the options each time; in our example, montreal is chosen.

Multiple cases can be defined and separated by a comma on a single line:

enum MLSTeam {     case montreal, toronto, newYork, columbus, lA, seattle } var theTeam ...