gistfile1.swift

func myPrint(str: String, #completion: () -> ()) {

    println(str)
    completion()
}

let words = ["foo", "bar", "baz"]

let finalCompletion = { println("Done") }

let myFunc = reduce(reverse(words), finalCompletion) {
    completion, word in

    return { myPrint(word, completion: completion) }
}

myFunc()