var addNameClosure: (String) -> String = { $0 + " Angie"}

func greetPeople(greetings: [String], closure: (String) -> String) -> String {
    var greeting = ""
    for aGreeting in greetings {
        greeting += closure(aGreeting)
    }
    return greeting
}

print(greetPeople(greetings: [" Hallo", " habari", " mambo"], closure: addNameClosure))

print(greetPeople(greetings: [" Hallo", " habari", " mambo"]) { name in return name + "Angie"})