AnimalViewModel.swift

class AnimalViewModel {

  let name: String
  let image: UIImage
  private let _hungry: Variable<Bool>
  var hungry: Observable<Bool> {
    return _hungry.asObservable()
  }
  
  init(animal: Animal) {
    name = animal.name
    image = animal.image
    _hungry = Variable(false)
  }  
  
}