Swift Functional Programming - Second Edition

Defining and using variadic functions

Swift enables us to define functions with variadic parameters. A variadic parameter accepts zero or more values of a specified type. Variadic parameters are similar to array parameters but they are more readable and can only be used as the last parameter in multi-parameter functions.

As variadic parameters can accept zero values, we will need to check whether they are empty.

The following example presents a function with variadic parameters of the String type:

func greet(names: String...) {     for name in names {         print("Greetings, \(name)")     } } // To call this function greet(names: "Josee", "Jorge") // prints twice greet(names: "Josee ", "Jorge ", "Marcio") // prints three times 

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