In this chapter, we became familiar with Swift 4 basics. We now know what variables and constants are. We can use basic types, the if and switch statements, and loops, and we can define functions. These are the smallest key building blocks that we will need to start our adventure in Swift 4 and the iOS/macOS/watchOS world.

In the next chapter, you will become familiar with Xcode—the development environment software that is really handy when we are writing code in Swift. You will develop your first playground, which is a nice tool to check and demo the code. You can use everything learned in this chapter, and, in the end, you will be familiar with how to add descriptions using a markup language to make your playgrounds and functions well documented. Don't spend a minute more—find a macOS and move to the next chapter to get your hands dirty with some real code.