From: Jim Weirich <jweirich@...>
Date: 2004-01-19T21:46:39+09:00
Subject: Re: setting instance variable "dynamically"

gabriele renzi wrote:

> you may even use instance_eval("@a="+value.to_s)

Be aware that this only works when "value" has valid string 
representation that can be reliably converted back to an object.  And 
then you only get a copy, not the original object.

The following will work with arbitrary objects ...

   obj.instance_eval("lambda { |v| @a = v }").call(value)

At this point you must be thinking:  "Why don't I just use 
instance_variable_set?"

-- 
-- Jim Weirich       jweirich@one.net      http://onestepback.org
-----------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)