From: Michael Neumann <neumann@...>
Date: 2001-07-20T05:12:13+09:00
Subject: [ruby-talk:18149] Re: instance variables by name?

jared l. jennings wrote:
> On Fri, Jul 20, 2001 at 03:18:31AM +0900, Barnett, Aaron wrote:
> > 
> > i'd like to have a method that operates on an instance variable given its
> > name...
> > 
> > class cat
> > 	def initialize()
> > 		@says = 'meow'
> > 	end
> > 
> > 	def set(name, value)
> > 		@<<name>> = value
> > 	end
> > end
> > 
> > cat.new().set('says', 'arf')
> > 
> > i figure it can be done but i cant find out how based on the documentation
> > i've found.
> > 
> > thanks
> >  aaron
> > 
> 
> here ya go
> 
> class Cat
>     def initialize
>         @says = 'meow'
>     end
> 
>     attr_accessor :says
> 
>     def set(name, value)
>         self.send(name+"=", value)


Or without defining an attr_accessor before:

  eval("@#{name}=value") if name =~ /^\w+$/


Regards,

  Michael

-- 
Michael Neumann
merlin.zwo InfoDesign GmbH
http://www.merlin-zwo.de