Chapter 8: Protocols, Extensions, and Error Handling
In the last chapter, you learned how to represent complex objects using classes or structures and how to use enumerations to group related values together.
To end this section on Swift, you'll learn about protocols, extensions, and error handling. Protocols define a blueprint of methods, properties, and other requirements that can be adopted by a class, structure, or enumeration. Extensions enable you to provide new functionality for an existing class, structure, or enumeration. Error handling covers how to handle errors in your program.
By the end of this chapter, you'll be able to write your own protocols to meet the requirements of your apps, use extensions to add new capabilities to existing types, and handle error conditions in your apps without crashing.
The following topics will be covered:
- Understanding protocols
- Understanding extensions
- Exploring error handling