iOS 10 Programming for Beginners

Functions

Now, it is time to get into a really fun part of programming and learn how to write functions. Functions are self-contained pieces of code that you want to run on something. In Swift 3, Apple has made a change to how you should write functions. All of the functions we will write in this chapter will perform an action (think of verbs). Let's create a simple function called greet():

func greet() {
  print("Hello")
}

This example is a basic function with a print statement in it. In programming, functions do not actually run until you call them. We call a function simply by calling its name. So, let's call greet:

greet()

That's it! We just created ...