<pride />

gistfile1.txt

  def descendant_leaves
    result = []
    result << children
    until result.flatten!.all?{|x| x.leaf?}
      result.each do |location|
        unless location.leaf?
          result << location.children
          result.delete(location)
        end
      end
    end
    result << self if leaf?
    result
  end

  def leaf?
    children.empty?
  end