From: killy-kun <killy-kun@...>
Date: 2006-03-22T17:48:50+09:00
Subject: Re: Is this a kind of design patterns?

Sam Kong wrote:
> Hi!
> 
> Sometimes a class provides object instantiation methods other than new.
> See an example.
> 
> class Color
>     def initialize r, g, b
>         @r = r
>         @g = g
>         @b = b
>     end
> 
>     def to_s
>         "R: #{@r}, G: #{@g}, B: #{@b}"
>     end
> 
>     class << self
>         def red
>             new 255, 0, 0
>         end
> 
>         def blue
>             new 0, 0, 255
>         end
> 
>         def green
>             new 0, 255, 0
>         end
>     end
> end
> 
> puts Color.new(100, 120, 140)
> puts Color.red
> puts Color.blue
> 
> 
> Is this one of design patterns, or just a simple idiom?
> It's similar to a factory method pattern but it's not according to the
> definition.
> Is there any name for it?
> 
> TIA.
> 
> Sam
> 

isn't that the facory design pattern ?