From: Joshua Abbott <joshnabbott@...>
Date: 2009-01-01T14:49:18+09:00
Subject: Re: How do I pass the name of an instance variable into an o

Thanks Greg! Much nicer than what I threw together.

-- Josh
http://iammrjoshua.com

Greg Donald wrote:
> On Wed, Dec 31, 2008 at 9:18 PM, Glenn <glenn_ritz@yahoo.com> wrote:
>>  end
>> x.print_instance_variables(:b) # writes the value of @b to the console
>> x.print_instance_variables(:a, :b) # writes the values of @a and @b to the console
>> x.print_instance_variables(:z) # causes an exception because there is no@z
>>
>> Any suggestions would be greatly appreciated.
> 
> 
> class SomeClass
>   def initialize
>     @a = 1
>     @b = 'xxx'
>   end
> 
>   def print_instance_variables( *args )
>     args.each do |arg|
>       raise unless instance_variable_defined?( "@#{ arg }" )
>       puts self.instance_variable_get( "@#{ arg }" )
>     end
>   end
> 
> end
> 
> x = SomeClass.new
> x.print_instance_variables( :a )
> x.print_instance_variables( :b )
> x.print_instance_variables( :a, :b )
> x.print_instance_variables( :z )

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