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iOS Swift Functions and Optionals Parameters and Tuples Named Parameters

Paramaters and Tuples challenge

My code should work (does in XCode), but the answer treehouse is looking for is different. Can someone explain

//my code

func greeting(#person: String) { println("Hello (person)") }

greeting ("Jerry")

// treehouse expected response func greeting(#person: String) { println("Hello (person)") }

greeting (person: "Jerry")

func greeting(#person: String) {
    println("Hello \(person)")

greeting ("Jerry")

Hi Vincent,

func greeting(#person: String) -> String{
    println("Hello \(person)")

greeting(person: "Jerry")

Your block above has an error which isn't printing your response; when you call greeting you are not passing it the argument label (person).