The previous section left you with a solid foundation you can use to build great, adaptive apps on. At this point, it is a good idea to take a step back and look at the code you have written to gain a deeper understanding of Swift and how it works under. This section focuses on teaching you more about Swift as a language, regardless of what you intend to build.

In this chapter, you will learn about Swift's fantastic type system. Swift's type system is one of its most powerful features because it allows developers to express complex and flexible principles safely and predictably. This chapter takes you through the following steps:

• You will learn about the types that are available to you
• You will learn about the differences between the types, including their pros and cons
• You will learn how to make informed decisions about the types you use in your code to make sure your code is of great quality