Swift Quick Syntax Reference

Chapter    27

Functions

You can declare a function anywhere with the func keyword. Functions are used to organize code into reusable chunks that take input parameters and return results. Listing 27-1 shows an example of a function that returns the string “Hello World.”

Listing 27-1. Simple Function

func getPhrase() -> String{    return "Hello World"}

In Listing 27-1, the function declaration starts with the func keyword followed by the name of the function. After the function name in Listing 27-1, you have (), which designates an empty parameter list. The return type of the function (String) is written after the return type symbol ->.

After the function return type, you have a code block designated in the curly brackets, {}. The getPhrase() ...