#+title: Hello, to my tutorial!

* Neato!
  :PROPERTIES:
  :CUSTOM_ID: Neato-
  :END:

  this is code

#+BEGIN_SRC ruby
def sum x, y
  x + y
  end

sum 1, 33
#+END_SRC

#+RESULTS:
: 34

* Woah
  :PROPERTIES:
  :CUSTOM_ID: Woah
  :END:

  bye, thanks for reading
* Linked Lists of length 5


#+BEGIN_SRC ruby :results output
class LL

  attr_accessor :memory

  def initialize
    @memory = nil, nil, nil, nil, nil
  end

  def head
    0
  end

  # Exercise: Fix me!
  def add val
      @memory[0] = val
  end

end

ll = LL.new
ll.add 33
p ll.memory
#+END_SRC

#+RESULTS:
: [33, nil, nil, nil, nil]