Omitting parameter labels
You might have noticed that we don’t actually send any parameter names when we call print() – we say print("Hello") rather than print(message: "Hello").
You can get this same behavior in your own functions by using an underscore, _, for your external parameter name, like this:
func greet(_ person: String) {
print("Hello, \(person)!")
}You can now call greet() without having to use the person parameter name:
greet("Taylor")This can make some code more natural to read, but generally it’s better to give your parameters external names to avoid confusion. For example, if I say setAlarm(5) it’s hard to tell what that means – does it set an alarm for five o’clock, set an alarm for five hours from now, or activate pre-configured alarm number 5?
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