Swift 4 Recipes: Hundreds of Useful Hand-picked Code Snippets

© Yanis Zafirópulos 2019

Yanis ZafirópulosSwift 4 Recipeshttps://doi.org/10.1007/978-1-4842-4182-0_5

5. Functions

Yanis Zafirópulos¹ 

(1)

Granada, Spain

 

In programming, a function is nothing but a named section of code – with or without arguments – which performs a specific task and may possibly also return a value. In this chapter, we’ll see how you can get the most out of them in Swift.

5.1 Define and call a function

Problem

I want to define and call a new function from scratch.

Solution

Let’s create a function sayHello.

func sayHello() {

      // This is the function 'body' - aka the statements

      print("Hello World!")

}

What about calling our function?

Note

Even without arguments, we must use parentheses

sayHello()

How It Works

Functions, by definition, ...