trying to make an Array without.. well.. an Array

nodelist.rb

class Node
  attr_accessor :index, :next, :value
  def initialize(index, value)
    @index, @value, @next = index, value, nil
  end
end

class NodeList
  include Enumerable

  def [](index); find { |node| node.index == index }; end

  def []=(index, value)
    self[index].value = value
  end

  def each(&blk)
    current_node = first
    loop do
      yield(current_node)
      current_node = current_node.next
      break if current_node.nil?
    end
  end

  def to_s
    (0...count).inject("") do |result, index|
      result << self[index].value << "#{',' unless index == count-1} "
    end
  end

  def <<(value)
    node = Node.new(@count, value)
    @first = node if @first.nil?
    @last.next = node unless @last.nil?
    @last = node
  end
end

list = NodeList.new
list << "wtf"
list << "omg"
list << "lol"

# p list[2].value # => "lol"
# list[2] = "BLArb!"
# p list[2].value # => "BLArb!"

puts list.to_s