From: jkarhart@... (Jason Arhart)
Date: 2002-03-26T07:19:50+09:00
Subject: Re: initialization problem?

hubert@cs.nyu.edu (Hubert Hung-Hsien Chang) wrote in message news:<98ba0902.0203251200.6f063e25@posting.google.com>...
> Can anyone explains what is happening in the following codes?
> 
> 
> 
> ---------------------------
> 
> class Hole
>   attr_accessor(:elements)
> 
>   def initialize
>       @elements = Array.new
>   end
> 
>   def be(value)
>       if(value.is_a?(Array))
>            @elements = value 
>       end       
>   end
> 
>   def to_s
>       result = ""
>       @elements.each {|x|
>                  result = result + "(" + x[0].to_s + "," + x[1].to_s + ")" 
>                 }
>       return result
>   end
> 
> end
> 
> 
> d= Hole.new()
> d.be([[3,2],[3,4]])
> puts d
> 
> puts
> 
> puts Hole.new().be([[3,2],[3,4]])
> 
> puts
> 
> (c = Hole.new).be([[3,2],[1,1,4]])
> puts c
> 
> 
> ---------------------------------------
> 
> (3,2)(3,4) # this, I know.
> 
> 3		#this output confused me.
> 2
> 3
> 4
> 
> (3,2)(1,1)  #this, I know

Hole#be as written returns @element.

If you do this instead:

---------------------------------------
   def be(value)
       if(value.is_a?(Array))
            @elements = value
       end
       self
   end
---------------------------------------

you should get the output you expect.

Jason Arhart