From: 7stud -- <bbxx789_05ss@...>
Date: 2011-04-29T02:23:13+09:00
Subject: Re: calling methods, beginner help

Ronnie Aa wrote in post #995566:
> Hello Guys,
>
> I'm fairly new to ruby and I have a question:
>
> I have an array:
>
> $xarray = [10,10]
>

Don't EVER use global variables.  Never, ever, ever, never.


> I have this method:
>
>  def product
>
>   inject(1) { |s, v| s *= v }
>
> end#def
>
>
>
> And I have a class:
>
>
> class Test
>
>      def initialize()
>
>      tt= $xarray.product
>
>      UI.messagebox tt
>
>
>      end#def
> end#class
>
>
>
>
> I want to use the method 'product' in my class. How do I do that ??
> Or more in general how do I define methods that I can use all through my
> ruby script???
>

If you want to use a method anywhere in your program, then you define it 
at the 'top level' just like you did.  However, a method defined at the 
top level is a private method, and a private method cannot be called 
with a 'receiver', for instance in this line:

$xarray.product

$xarray is the receiver.  The only way you can call the product() method 
is like this:

product()

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