Nick Brown wrote:
> 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.

Thanks guys
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