From: Paul Roche <prpaulroche@...>
Date: 2010-10-07T07:03:19+09:00
Subject: Re: Error when using class variables with operators

Jeremy Bopp wrote:
> On 10/6/2010 2:58 PM, Jeremy Bopp wrote:
>>>>> |
>>>
>>> def self.on_target?(mltn)
>>>
>> class variables shared among all instances of your class, which is
>> end
>> @target2.  I found these notations a little hard to remember at first,
>> but you'll find that defining class variables is pretty rare and that
>> you can usually just use @variable. :-)
> 
> Hmm.  Looking closer at what you're trying to do, I see that you do need
> the class variables in your current implementation.  The problem is that
> I can't figure out why you are trying to use a class method (on_target?)
> for this rather than an instance method.  It looks like Stefano is also
> confused about what you're trying to do here.
> 
> Please understand that you are mixing together class and instance
> methods.  For now you should probably stick to instance methods since
> they are more common:
> 
> class MyClass
>   def my_instance_method
>     ...
>   end
> end
> 
> Rather than...
> 
> class MyClass
>   def self.my_class_method
>     ...
>   end
> end
> 
> 
> Once you have a handle on instance methods, understanding class methods
> and how they differ from instance methods will be easier.
> 
> -Jeremy

Thanks guys for the help. Stefano, I stuck a 'p' in and I got a nil. 
Jeremy I understand where you are coming from when you say stick to 
instance methods before using class methods. However I need to make one 
method a class method (it's more complex than the example I gave above). 
I will then be calling a method from here (presumingly this has to be a 
class method too?) Thanks for the patience, I'm slow on the uptake
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