Swift Enum

In Swift, an enum, short for enumeration, is a special type used to define a group of related values or states. Using an enum, you can define a set of possible values for a variable or constant.

Syntax

You can define an enum in Swift using the following syntax:

enum EnumName {
    case value1
    case value2
    case value3
    // additional values
}

The case keyword is used to define each possible value for the enum. You can add additional cases as needed.

Example

Here is an example of a simple enum in Swift:

enum DayOfWeek {
    case sunday
    case monday
    case tuesday
    case wednesday
    case thursday
    case friday
    case saturday
}

Output

In the above example, you have defined an enum called DayOfWeek. This enum has seven possible values, each representing a day of the week.

Explanation

Each case in the DayOfWeek enum represents a possible value for the enum. When you use this enum in your code, you can set a variable or constant to one of these values, like so:

let firstDayOfWeek = DayOfWeek.sunday

This sets the constant firstDayOfWeek to the value sunday in the DayOfWeek enum.

Use

Enums are commonly used in Swift to represent a group of related values or states. They can be used to define sets of values for properties, methods, and function parameters.

Important Points

• Enums are used to define a group of related values or states.
• Each possible value in an enum is defined using the case keyword.
• Enums can be used to define sets of values for properties, methods, and function parameters.
• Enums can have associated values, which can be used to store additional data for each value.
• Enums can have raw values, which are assigned automatically to each possible value.

Summary

In Swift, an enum is a powerful tool for defining a group of related values or states. With enums, you can define a set of possible values for a variable or constant, and use these values throughout your code. Enums are easy to use and can help make your code more readable and maintainable.