'The functional scene needs to have this kind of book, one with not only theoretical functional domain chapters, but with practice in the area too.' German Gonzalez-Morris 'A much desired bridge between the theoretical understanding of functional programming and the ability to design and construct entire software systems using it.' Makarand Deshpande 'A very detailed look at functional design with rich examples.' Charles Earl 'A great book which show you different aspects of Haskell which are very uncommon to see in other articles or books.' Andres Sacco 'If you want to design real world applications in Haskell with a focus on elegance, flexibility, and scalability, you must read this book.' David Paccoud