Default value for Enum in Swift

Question

I have an enum :

public enum PersonType:String {

 case Cool                       = "cool"
 case Nice                       = "rude"
 case SoLazy                     = "so-lazy"

 public var description: String {
    switch self {
    case .Cool:
        return "Cool person"
    case .Nice:
        return "Nice person"
    case .SoLazy:
        return "its so lazy person"
    }
}


 public var typeImage: String {
    switch self {
    case .Cool:
        return "cool.png"
    case .Nice:
        return "img_nice.png"
    case .Solazy:
        return "lazy.png"
    }
   }  

}

The problem I don't know all the person type keys so I need to handle a default case of type person and to give it the description will be it's key like "so-lazy" and a default image.

let's say I get this result from the web service:

[
    {
        name: "john",
        key: "cool"
    },
    {
        name: "paul",
        key: "funny"
    }
]

I need to have a a default case to handle the key "funny"

here is how I init my enum while parsing and creating person object:

if let personType = PersonType(rawValue:personTypeKey ?? "") {
   self.personType = personType
}

I want an else or a better approach to handle the case of unknown keys in my enum, and give them the key as description and a default image.

Answer 1

Another approach that works in Swift 3 (maybe 2, don't know):

enum PersonType: String {
    case cool = "cool"
    case nice = "nice"
    case soLazy = "so-lazy"
    case other
}

let person = PersonType(rawValue: "funny") ?? .other

The person variable is of type PersonType.other in this case.

The downside to this is that you don't know the raw string value of the .other case.