Summary
In this chapter, we looked at Swift's error handling features. While we are not required to use these features in our custom types, they do give us a uniform way to handle and respond to errors. Apple has also started to use this form of error handling in their frameworks. It is recommended that we use error handling in our code.
We also looked at the availability attribute, which allows us to develop applications that take advantage of the latest features of our target operating systems, while still allowing our applications to run on older versions. In the next chapter, we'll take a look at how to write custom subscripts.
