7 Mar 2023 . 2 min read @gurjitpt
Enumerations defines a type for group of related values.
Enumerations (enum) enables you to write code in a type safe way. Enum is very useful while defining common type of values. You don't have to provide value while defining enum.
You can declare enumerations with enum keyword.
enum SomeEnumerations {
}
Here is a basic example of defining enumeration. You can use case keyword to define new enumeration cases.
enum Direction {
case north
case south
case east
case west
}
You can also define cases in single line rather than multiple lines. For example,
enum DaysOfWeek {
case sunday, monday, tuesday, wednesday, thursday, friday, saturday
}
You can assign enum value to new variable in following way.
var day = DaysOfWeek.sunday
You can match value of enum using switch statement in following way.
var direction = Direction.west
switch direction {
case .east:
print("Marked with E")
case .west:
print("Marked with W")
case .north:
print("Marked with N")
case .south:
print("Marked with S")
default:
print("Direction not found")
}
You can perform iteration over enum cases using CaseIterable. You have to write CaseIterable after the enum name. For example,
enum Season: CaseIterable {
case summer, winter, spring, autumn
}
let typeofSeasons = Season.allcases.count
print("There are \(typeofSeasons) type of seasons.")
You can iterate over all cases of enum using for-in loop.
for season in Season.allCases {
print(season)
}
Don’t hesitate to contact me if you have any questions or queries. Follow me on twitter @gurjitpt for any updates.
Thanks!
WRITTEN BY
Gurjit Singh
I’m Computer Science graduate and an iOS Engineer who writes about Swift and iOS development. Follow me on twitter @gurjitpt for more updates.
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