What is wrong with my code? I've been stuck for about 20 minutes

i´m sorry, i didn´t see the hash Tag in your first post:

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

The prompt is:

Call the greeting function and pass it the String "Jerry"

Try it this way:

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

greeting("Jerry")

And here´s why:

You created a function and want to pass it an parameter in order to obtain your result. In this example Jerry.

By calling the function greeting(person) you are not passing the type of value that the function is expecting. In this case the function expects a String. The function tells you in it´s parameters, what it is expecting.

Another example:

func age(personsAge: Int){
println("I am \(personsAge) Years old.")
}

age(34)

in this case the function is expecting a parameter of type Int (Integer = whole number)

I hope this helps a little bit.

That didn't work either..

"Bummer! You need to define a func named greeting that takes one String parameter named person."

Thank you so much! That makes sense.