From: James Edward Gray II <james@...>
Date: 2007-04-04T22:37:45+09:00
Subject: Re: Everything is a object?

On Apr 4, 2007, at 8:30 AM, tsela.cg@gmail.com wrote:

> No. "attr_accessor" only defines two instance methods within the class
> you're using it in, which allow @var (which is a private instance
> variable) to be accessible from outside its object. In other words,
>
> class SomeClass
>
>   attr_accessor :var
>
> end
>
> is exactly equivalent to:
>
> class SomeClass
>
>   def var
>     @var
>   end
>
>   def var=(param)
>     @var = param
>   end
> end

Not "exactly equivalent."  It also silences the warning:

$ ruby -we 'class Test; def var; @var; end; end; p Test.new.var'
-e:1: warning: instance variable @var not initialized
nil
$ ruby -we 'class Test; attr_reader :var; end; p Test.new.var'
nil

James Edward Gray II