fcheung

class Tree
    attr_accessor :payload, :children
    def initialize(payload, children = [])
        @payload = payload
        @children = children
    end 

    def traverse(&block)
      yield self
      @children.each {|child| child.traverse(&block)}

fcheung

class Image
  attr_accessor :data
  def initialize (data)
     @data = data  
  end

  def image_blur
    changes = []

    @data.each_with_index do |row, row_index|

fcheung

class Image
	attr_accessor :data
   	def initialize (data)
     	@data = data  
   	end

    def output
      @data.each do |sub|
        sub.each do |cell|
          print cell