From: Tony Arcieri <tony.arcieri@...>
Date: 2010-10-07T07:37:58+09:00
Subject: Re: Missing @ for instace variable in class, but no error message

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attr_accessor defines the Test#a method which is a getter for the @a
instance variable

On Wed, Oct 6, 2010 at 4:11 PM, Stefan Salewski <mail@ssalewski.de> wrote:

> Some days ago I was defining a class, but forgot to use the leading @
> for an instance variable. But it still works -- that variable was made
> accessible by attr_accessor statement. So my question:
>
> Why gives the statement "puts a" no error message? In my opinion it
> should give one, I forgot to use @. The "attr_accessor :a" was only
> there to allow access from outside of that class, for instance
> variables.
>
> #!/usr/bin/ruby -w
> class Test
>  attr_accessor :a
>  def initialize
>    @a = 0
>    @b = 1
>  end
>  def show_values
>    puts a # should be @a, but seems to work
>    puts b # gives an error, as expected
>  end
> end
> t = Test.new
> t.show_values
>
> Output is:
> ruby --version
> ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]
>
> ruby test.rb
> 0
> test.rb:11:in `show_values': undefined local variable or method `b' for
> #<Test:0x7f85f99c02f8 @b=1, @a=0> (NameError)
>        from test.rb:16
>
> Best regards,
>
> Stefan Salewski
>
>
>
>


-- 
Tony Arcieri
Medioh! A Kudelski Brand

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