From: Raul Parolari <raulparolari@...>
Date: 2007-11-14T11:54:15+09:00
Subject: Re: recursion with blocks

James Gray wrote:

> 
> Does this give you some ideas?
>
> class Tree
>    def initialize(name)
>      @name   = name
>      @leaves = Array.new
>    end
> 
>    attr_reader :name
> 
>    def <<(leaf_name)
>      @leaves << self.class.new(leaf_name)
>      self
>    end
>    ..

I played with this Tree for a while (amazed by its simplicity and 
functionality); just a small problem when connecting (and printing) 
Trees to each other. A small touch to the << method does it:

 def <<(leaf_name)
   case leaf_name
      when String
        @leaves << self.class.new(leaf_name)
      when Tree
        @leaves << leaf_name
      else raise
   end
   self
 end


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