From: Josh Cheek <josh.cheek@...>
Date: 2009-11-13T09:45:05+09:00
Subject: Re: newbie ..need help with metaprogramming..

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On Thu, Nov 12, 2009 at 6:05 PM, Dhaval <dhavalvthaker@gmail.com> wrote:

> hi, i wrote a small code to check metaprogramming in ruby..what am i
> doing wrong..can you pl help?
>
> class Testvar
>  attr_accessor :a1
>  def initialize
>  @a1='init'
> end
> end
>
> var =":a1"
>
> t = Testvar.new
> if t.respond_to?("#{var}")
>  p 'test 1- pass'
> end
> if t.instance_variable_set var , 'abc'
>  p 'test 2-pass'
> end
> if t.send var , 'def'
>  p 'test 3-pass'
> end
>
>
Try like this:

class Testvar
  attr_accessor :a1
  def initialize
    @a1='init'
  end
end

var = :a1

t = Testvar.new

if t.respond_to?(var)
  puts 'test 1- pass'
end

t.instance_variable_set "@#{var}" , 'abc'
if t.instance_variable_get("@#{var}") == 'abc'
  puts 'test 2-pass'
end

t.send "#{var}=" , 'def'
if t.send(var) == 'def'
  puts 'test 3-pass'
end

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