tree example

tree.rb

class Node
  attr_accessor :dad, :name
  
  def initialize(name='', dad=nil)
    @name, @dad = name, dad
  end
  
  def inspect
    "My dad is #{@dad} "
  end

  def init?
    @dad.nil?
  end

  def to_s
    "Node: #{@name}"
  end
  
  def next
    
  end
end

class TreeNode < Node
  attr_accessor :left, :right
  
  def initialize(name='', dad=nil left=nil, right=nil)
    super name, dad
    @left, @right, @dad = left, right
  end
  
  def inspect
    super + "left #{@left} - right #{@right}"
  end
end

init = Node.new name="Dad"
fl = Node.new name="Saad"
fr = Node.new name="Saleh"

init.left = fl
init.right = fr

fl.dad = init
fr.dad = init

p init
p fl
p fr

p init.init?
p fl.init?