This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
This tutorial belongs to the Swift series
Enumerations are a way to group a set of different options, under a common name.
Example:
enum Animal {
case dog
case cat
case mouse
case horse
}This Animal enum is now a type.
A type whose value can only be one of the cases listed.
If you define a variable of type Animal:
var animal: Animalyou can later decide which value to assign it using this syntax:
var animal: Animal
animal = .dogWe can use enumerations in control structures like switches:
enum Animal {
case dog
case cat
case mouse
case horse
}
let animal = Animal.dog
switch animal {
case .dog: print("dog")
case .cat: print("cat")
default: print("another animal")
}Enumerations values can be strings, characters or numbers.
You can also define an enum on a single line:
enum Animal {
case dog, cat, mouse, horse
}And you can also add type declaration to the enumeration, and each case has a value of that type assigned:
enum Animal: Int {
case dog = 1
case cat = 2
case mouse = 3
case horse = 4
}Once you have a variable, you can get this value using its rawValue property:
enum Animal: Int {
case dog = 1
case cat = 2
case mouse = 3
case horse = 4
}
var animal: Animal
animal = .dog
animal.rawValue //1Enumerations are a value type. This means they are copied when passed to a function, or when returned from a function. And when we assign a variable pointing to an enumeration to another variable.
This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
flaviocopes.com | Sciencx (2021-06-08T05:00:00+00:00) Swift Enumerations. Retrieved from https://www.scien.cx/2021/06/08/swift-enumerations/
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