How to use switch with enum for string

Question

Sorry for the extremely basic question, but I want to figure out how to use a switch statement with cases that check if it's a certain string.

For example if I have an AnimalType enum and then I have an animal struct:

enum AnimalType: String {
   case Mammal = "Mammal"
   case Reptile = "Reptile"
   case Fish = "Fish"
}

struct Animal {
   let name: String
   let type: String
}

If I want to go through a list of Animals and then have a switch statement, how would I match the Animal.Type string to the enum? I don't want to change the Animal struct to let type: AnimalType either.

switch Animal.type {
case :
...// how do I match the string to the enum?

Answer 1

enum Command: String {
   case Mammal = "Mammal"
   case Reptile = "Reptile"
   case Fish = "Fish"
}

let command = Command(rawValue: "d")

switch command {
case .Mammal?:
    print("Mammal")
case .Reptile?:
    print("second")
case .Fish?:
    print("third")
case nil:
    print("not found")
}
// prints "not found"

Answer 2

You can create an animal type from string rawValue and switch on that: But first I'd change the cases to lowercase, thats the preferred style in Swift.

func checkType(of animal: Animal) {
    guard let animalType = AnimalType(rawValue: animal.type) else {
        print("Not an animal type")
        return
    }
    switch animalType {
    case .mammal: break
    case .reptile: break
    case .fish: break
    }
}

Alternatively, you can also switch on the string and compare if it matches any of your AnimalType rawValues:

func checkType(of animal: Animal) {
    switch animal.type {
    case AnimalType.mammal.rawValue: break
    case AnimalType.reptile.rawValue: break
    case AnimalType.fish.rawValue: break
    default:
        print("Not an animal type")
        break
    }
}