From: Enrique Comba Riepenhausen <ecomba@...>
Date: 2007-05-10T22:10:02+09:00
Subject: Re: The Factory Method


On 10 May 2007, at 14:33, James Edward Gray II wrote:

> On May 10, 2007, at 1:56 AM, Enrique Comba Riepenhausen wrote:
>
>> I was thinking about the Factory Method Pattern and following came  
>> to my mind.
>
> In addition to Pat's great answer, I think it's important to note  
> that classes are objects in Ruby.  This often aids in Factory  
> pattern scenarios.  For example:
>
> >> class Prose
> >>   def initialize(title, author)
> >>     @title = title
> >>     @author = author
> >>   end
> >>   def inspect
> >>     "#{self.class}:  #{@title} by #{@author}"
> >>   end
> >> end
> => nil
> >> class Novel < Prose; end
> => nil
> >> class ShortStory < Prose; end
> => nil
> >> class Author
> >>   def initialize(name)
> >>     @name = name
> >>   end
> >>   def to_s
> >>     @name
> >>   end
> >>   def write(type, title)
> >>     type.new(title, self)
> >>   end
> >> end
> => nil
> >> james = Author.new("James")
> => #<Author:0x14a11d0 @name="James">
> >> james.write(Novel, "Ruby:  The Girl I Loved")
> => Novel:  Ruby:  The Girl I Loved by James
> >> james.write(ShortStory, "Little Ruby Riding Hood")
> => ShortStory:  Little Ruby Riding Hood by James
>
> Just some more food for thought.
>
> James Edward Gray II

Thanks a lot James, I think this clarifies (at least from the newbie  
point of view) a lot of the power under the hood in Ruby!

I'm now thinking where to include this in the Wiki.

  Any idea?

Cheers, and thanks again!

>
>