Swift Enumerations (Enums): Understanding & Using Them in Your Code

Swift Programming

Difficulty: Beginner | Easy | Normal | Advanced

If you’re looking for the ultimate guide to enums then you’re in the right place. Within the article, I will explore what enums are, why you should use them, and their benefits! 😎

What are enums?

An enum is a user-defined data type that consists of a set of related values. Enums are often used to represent a group of related options, such as the days of the week or the suits in a deck of cards.

Enums are a great way to organize your code and make it more readable. They can also help you avoid errors by only using valid values.

swift enum meme

What are the benefits of using enumerations in Swift:

  • Enums can be used to create well-defined groups of related values, which can make code more readable and maintainable
  • Enums can be used to define types with a finite set of values, which can be useful when working with data that can only take on a limited number of values
  • Enums can be helpful for managing complex data
  • Enums can be used to group related values together, which can make code more organized and easier to read

Enum Syntax

The enum syntax is a keyword used to declare an enumerated type. An enumerated type is a type that consists of a set of named values. The following case could be used for a compass:

How to use a Switch Statement with an Enum

A switch statement in Swift allows you to execute different blocks of code based on the value of a particular expression.

What is the CaseIterable protocol?

CaseIterable is a protocol in Swift that allows for an easy way to iterate over all cases of an enum. This can be useful when you need to perform an action for each case of an enum.

What are Associated Values in Swift?

Associated values are values that can be stored along with an enum case.

There are many reasons to use associated values with an enum in Swift. One common use case is to store additional information about each enum case. This can be useful when you need to store different types of data with each case, or when the data for each case is too complex to fit into a single property.

Another reason to use associated values is to provide more context for each enum case. This can be helpful when you have a long list of cases and you want to provide a brief description for each one.

What are raw values for enums in swift?

The raw values for enums in swift are the underlying values associated with each enum case. These values can be integers, strings, or any other type.

Potential Interview Questions about Enums

  1. How do you define an enum in Swift?
  2. Can you give an example of when you would use an enum in your code?
  3. How do you associate values with an enum case?
  4. How do you use the switch statement with an enum?
  5. How do you ensure type-safety when using enums?
  6. What are the benefits of using enums in your code?
  7. How do you add new cases to an existing enum?
  8. Can you explain the difference between a raw value and associated value in an enum?
  9. How do you handle enums with optionals?
  10. How do you iterate over all cases of an enum?

Wrap Up

  • Swift enumerations are a way of defining a group of related values in a structured way
  • Enumerations can have a number of different properties, including rawValue and associatedValue
  • Enumerations can be used in a number of different ways, including in “switch” statements and “for-in” loops

Cheat sheet

Further reading:

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