An enumeration defines a common type for a group of related values and enables you to work with those values in a type-safe way within your code.
Enumeration Syntax
You introduce enumerations with the enum keyword and place their entire definition within a pair of braces:
enum SomeEnumeration {
// enumeration definition goes here
}
Here’s an example for the four main points of a compass:
enum CompassPoint {
case north
case south
case east
case west
}
docs.swift.org/swift-book/LanguageGuide/Enumerations.html
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