Swift: A function that does not return anything

As you can see, we use func to define a function.  The earlier example shows how to define a function that returns a string.  If you do not need the function to return anything, this is how we define it.

import UIKit


func sayHello(personName: String) {
    let greeting = "Hello, " + personName + "!"
    print(greeting)
}

sayHello("John")

swift

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