Thank you for your valuable comments. We do agree with you that the Alexa V2 sdk follows a slightly different approach, which is more concise as compared to the verbose approach of V1 Sdk for handling intents and supplying responses for the same.
Hi Eduardo, Thanks for reading and sharing your thoughts. The book (and the code) to which this article pertains to was released before the release of Alexa ASK v2. However, the code is completely backwards compatible.
Also, we are in a discussion for an updated version of the book and will update this space as soon as we have more information.