From: 7stud 7stud <dolgun@...>
Date: 2007-09-01T12:23:37+09:00
Subject: attr_reader

On p. 30-31 of "Programming Ruby (2nd ed)",  there is this example:

class Song
  attr_reader :name, :artist, :duration
end

and the text says:

"The corresponding instance variables, @name, @artist, and @duration,
will be created for you."

But I discovered that I still have to define an initialize method to
create objects:

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

So, it seems like initialize is what creates the instance variables.
Or, does attr_reader somehow do its thing before initialize is called?
If so, why is it considered important to know that attr_reader creates
the instance variables instead of initialize?
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