So for your inventory tracking system the following enum is an ideal data model or this object: The former contains a sequence of 4 digits, the latter incapsulates a string.
Imagine a system where you operate products marked by one of the two types of barcodes: 1D barcodes in UPC format and 2D barcodes in QR code format: The classical example of such model is product barcodes. Moreover the amount and the types of these values can differ from case to case. That means that you can define an enumeration to store some associated values of any type alongside the actual cases. (The notion itself has quite a long history in computer science and is being used in other languages. Hopefully it will be live in the language soon.Ībility to have some associated data is one of the greatest enum features in Swift. If you are interested, follow E-0295: Codable synthesis for enums with associated values. UPD: (Jan 2021) Just recently the discussion started again on the swift forum. UPD: (Jun 2021) Now it’s build in in the language (Swift 5.5) Swift evolution proposal (released), so in most cases the compiler will do this for you. Enumerations can also define custom initialisers, can be extended to expand their functionality beyond their original implementation, and can conform to protocols to provide standard functionality. They adopt many features traditionally supported only by classes, such as computed properties or static and instance methods. Enumerations are not just first-class citizens in Swift.
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