Swift

5.4    Returning Values

You know by now that functions can import parameters—both obligatory and optional ones. In this section, you will learn about a new feature: Functions can return values as well, which is often the result of the operation within the function.

5.4.1    Returning Single Values

To understand the syntax to return values, let’s start with a very simple example. Listing 5.25 contains a function that calculates the sum of two numbers and returns the result. Heads up: Returning the result is the new part!

func sumNumbers(_ n1: Int, _ n2: Int) -> Int {    let sum = n1 + n2    return sum}  

Listing 5.25     Simple Function Returning Sum of Two Numbers

This code snippet has two parts worth noting. First, the signature ends with the -> Int ...