Learning Swift™ Programming

Defining Functions

In Swift, a function is made up of three components: a name, parameters, and a return type. The syntax for this type of declaration is as follows:

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func functionName(parameterName: parameterType) -> returnType {  //code}

This syntax is very different from Objective-C method declarations. However, if you have ever used JavaScript, Python, C, or many other languages, then this syntax will be pretty familiar. You will find that while the structure of functions is different, there are parts that make it compatible with Objective-C.

Let’s look at some examples, starting with a function that takes no arguments and has no return values:

func sayHello() {    println("Hello!")}

Here you write the keyword ...