#swift enum example for #medium

enum-example.swift

enum SerializationError: Error {
    case missing(String)
    case invalid(String, Any)
}

// in some deserialization code
// ...
    guard let vertexData = json["vertices"] as? [NSNumber] else {
        throw SerializationError.missing("vertices")
    }
// ...

// handling errors with different associated values
switch serializationError {
case .missing(let what):
    print("\(what) is missing")
case .invalid(let what, let someObject):
    print("\(what) is invalid: \(someObject)")
}