In this chapter, we looked at how Xcode runs our playground and what a program can look like without the concept of functions. The concept of functions was introduced on a metaphorical level with tips on how one can visualize a function, with three common characteristics of a function being the following:

Further, we looked at different examples of functions written in Swift before creating our own function for simulating the task of creating a pizza.

In the next chapter, we will explore new and exciting concepts of programming, such as arrays and dictionaries, which are useful for storing our values in boxes.