tree like structure with blocks and recursion

ruby_tree.rb

#!/usr/bin/ruby

class Tree
  attr_accessor :children, :node_name

  def initialize(name, children)
    @children = children
    @node_name = name
  end

  def visit_all(&block)
    visit &block
    children.each {|c| c.visit_all &block}
  end

  def visit(&block)
    block.call self
  end
end

ruby_tree  = Tree.new("Ruby", [Tree.new("Reia", []), Tree.new("MacRuby", [])])

puts "visiting a node"
puts ruby_tree.visit {|node| puts node.node_name}
puts

puts "visiting entire tree"
ruby_tree.visit_all {|node| puts node.node_name}