import Cocoa

/* Create a function that takes a string and returns a string. */
func sayHello(name: String) -> String {
    return "Hello \(name)!"
}
/* print the result of calling sayHello with "Cocoa" as the argument. */
print(sayHello(name: "Cocoa"))

/* Create a closure that takes a string and returns a string. */
let sayHelloClosure = { (name: String) -> String in
    return "Hello \(name)!"
}
/* print the result of calling sayHelloClosure with "Cocoa" as the argument. */
print(sayHelloClosure("Closure"))

Output

Hello Cocoa!

Hello Closure!