// Pseudocode

// Problems:
// - no cached state
// - can't display error over existing content
// - not easily reusable

// Is less verbose, perhaps quicker to understand.

class ViewController {
    enum State {
        case loading
        case success(JSON?)
        case failure(Error?)
    }
  
    var state: State {
       didSet { updateTheUI() }
    }
    
    init {
        load()
    }
  
    func load() {
        state = .loading
        async {
            loadData { data, error in 
                if let json = JSON(data) {
                    self.state = .success(json)
                } else {
                    self.state = .failure(error ?? ParsingError())
                }
            }
        }
    }
      
    func updateTheUI() {
        // Handle the state enum to draw correct UI 
    }
}