From: 7stud *** <dolgun@...>
Date: 2007-09-01T12:58:11+09:00
Subject: Re: attr_reader

Pe単a, Botp wrote:
> From: 7stud 7stud [mailto:dolgun@excite.com]
> # "The corresponding instance variables, @name, @artist, and @duration,
> # will be created for you."
> 
> that should read: "The corresponding instance variable getter and setter 
> methods will be created for you."
> 

Huh?  As far as I can tell, no setter methods are created:

class Song
    attr_reader :x, :y, :z

    def initialize(x, y, z)
        @x = x
        @y = y
        @z = z
    end
end

s = Song.new (10, 20, 30)
puts s.x
s.x = 40

--output:--
10
r1test.rb:22: undefined method `x=' for #<Song:0x253c8 @y=20, @x=10, 
@z=30> (NoMethodError)


> 
> #So, it seems like initialize is what creates the instance variables.
> 
> not really.
> 
> irb(main):097:0> class Song2
> irb(main):098:1>   attr_accessor :x, :y
> irb(main):099:1> end
> => nil
> 
> note, no initialization there
>

My program has no attr_accessor line (the book hasn't mentioned 
attr_accessor yet).  Your saying the initialize method in my program 
doesn't create the instance variables?  What does?

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