Stupid fibonacci numbers generator =)

fibquence.rb

class Fibquence < Array
  def initialize(quantity = 0)
    case quantity
    when 0
      # nothing
    when 1
      add_first
    else
      self << 0 << 1
      (quantity - 2).times { self << next_num }
    end
  end

  def gen_next(quantity = 1)
    quantity.times { self << next_num }
  end
  
private

  def add_first
    self << 0
    0
  end

  def prev
    if empty?
      add_first
    elsif size == 1
      0
    else
      self[-2]
    end
  end

  def next_num
    if prev.zero?
      1
    else
      prev + last
    end
  end
  
end

f = Fibquence.new(10) #=> [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
f.size #=> 10
f.gen_next 
f.size #=> 11
f.gen_next(1000)
f.size #=> 1011