Access enum associated value as optional

Question

How can I access an enum value for a specific case without having to implement an enum function for each case?

I\'m thinking something like this:

enum Re         


        

Answer 1

Add two computed properties for success case and failure case respectively.

enum Result {
  case success(S)
  case failure(F)

  var successValue: S? {
    switch self {
    case .success(let value):
      return value
    case .failure:
      return nil
    }
  }

  var failureValue: F? {
    switch self {
    case .failure(let value):
      return value
    case .success:
      return nil
    }
  }
}


let resultSuccess = Result.success(1)
let resultFailure = Result.failure("Error")

if let error = resultFailure.failureValue {
  // do something
  print(error)
}