Conclusion

Here’s what you learned in this lesson:

• Inheritance and polymorphism enable you to create flexible, reusable code.
• You created a PublicDomainObject subclass of MuseumObject.
• It has a property, primaryImageSmall, that isn’t in the parent class, so you added it to the primary constructor.
• You redefined showImage(), then called this method from a MuseumObject and from a PublicDomainObject.
• Each object behaved according to its type: The MuseumObject used WebViewComposable, and the PublicDomainObject used MuseumObjectComposable.