From: Clifford Leung <momonariex@...>
Date: 2009-04-28T17:20:07+09:00
Subject: Re: KaraokeSong#to_s example in book

Jes�s Gabriel y Gal�n wrote:
> On Tue, Apr 28, 2009 at 12:40 AM, Clifford Leung <momonariex@gmail.com> wrote:
>> I could understand if that was the case, but that's not the case in the
>> example in the book.
> 
> The point is that if you limit yourself to using the public interface
> of a class,
> you protect yourself against changes in the internal implementation.
> 
> Say that tomorrow, the implementer of the Song class receives a new requirement,
> and he decides to store the duration in ms, to more easily implement the new
> functionality. Then, if you have used the internal implementation, you
> have a problem.
> 
> Hope this helps.
> 
> Jesus.
> 

I think I've got it.

Thanks.