From: Vl Online <vlonline@126.com>
Date: 2008-09-01T23:44:16+09:00
Subject: Re: accessing instance variable

> 
> how do I access an instance variable if not via 
> object.instance_variable?
>

To access instance variable, you need to define attribute 
reader/writer/accessor inside the class.

Attribute reader definition syntax

attr_reader :a, :b, :c
or
attr_reader 'a', 'b', 'c'

Attribute writer definition syntax

attr_writer :a, :b, :c
or
attr_writer 'a', 'b', 'c'

Attribute accessor (support read and write) definition syntax

attr_accessor :a, :b, :c
or
attr_accessor 'a', 'b', 'c'

Example of Class Obj

class Obj
  attr_reader :a
  attr_writer :b
  attr_accessor :c

  def set_a(param)
    @a = param
  end

  def get_b
    @b
  end
end

a_obj = Obj.new

a_obj.set_a = 1
puts a_obj.a

a_obj.b = 2
puts a_obj.get_b

a_obj.c = 3
puts a_obj.c




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