reverse.swift

extension Array {
    func first() -> T {
        return self[0]
    }

    func last() -> T {
        return self[self.count - 1]
    }
}

func reverse<T>(items: [T]) -> [T] {
    if items.count == 0 {
        return [T]()
    }

    return reverse(items[1..<items.count]) + [items.first()]
}

let items = [1, 2, 3]
reverse(items)