8
Protocols, Extensions, and Error Handling
In the previous chapter, you learned how to represent complex objects using classes or structures and how to use enumerations to group related values together.
In this chapter, 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 respond to and recover from 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 ...
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