From: Nick Brown <nick@...>
Date: 2010-02-26T01:09:18+09:00
Subject: Re: Ruby class

Alex: Because Ruby is a dynamically-typed language, it doesn't have to 
"see" the method. At runtime, if current_item happens to be an object 
with responds to the 'increment_quantity' method, then 
current_item.increment_quantity will work fine.

If the object does not respond to that method, it will raise an error.
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