Enums with associated values in swift

Enums with associated values Enums are a collection of distinct values that some how belong together. An example of an enum would be

enum Gender { case male

 

case female

 

case others }

Here use can see that the enum gender is a collection of genders. For most cases these kind of simple enums would suffice. But for complex cases this wont suffice. Lets look into a example, lets make a enum for celestial bodies

enum CelestialBodies { 

case star

case blackHoles

case comets

case astroids

case planet }

The enum celestial bodies does not hold any additional info about the cases. Lets alter it a bit. 

 1. Add size attribute to star 

 2. Add info comet to check if pose any threat to earth and its closest distance to earth 

 3. Add info to planet whether it can support life enum 

CelestialBodies { 

 case star(size:Int) 

 case blackHoles 

 case comets(threartToEarth:Bool, closestDistanceToEarth:Double) 

 case astroids case planet(canSupportLife:Bool) } 

 var celentialBodyComet = CelestialBodies.comets(threartToEarth: false, closestDistanceToEarth: 954000) 

 switch celentialBodyComet { 

 case .star(size: let size): 

print(size) 

 case .blackHoles:

print("Black hole")  

 case .comets(threartToEarth: let threartToEarth, closestDistanceToEarth: let  closestDistanceToEarth): 

print("Its a comet")

print("At a distance of \(closestDistanceToEarth) its a threat \(threartToEarth)") 

 case .astroids:

print("astroids")  

case .planet(canSupportLife: let canSupportLife):

print("Planet car support life : \(canSupportLife)") 

}