This book presents a pragmatic approach on how you can develop a full application using this pattern. Real code is possibly the best way to explain the advantages of using a design pattern and this book shows a comparison of the code needed to build a sample application adopting and not adopting MVC. Backbone.js, one of the most popular MVC/MV* frameworks, it is also brought as term of comparison.
The sample application mentioned previously is built using Backbone.js to show how the use of a framework can help and speed up your development process. Client-side applications are becoming larger and larger and having a pattern to use as a guideline can definitely be very advantageous for producing maintainable and scalable applications.