One of the leading textbooks on Haskell programming, this third edition is thoroughly revised throughout and includes new material on testing and domain-specific languages and a variety of new examples and case studies, including simple games. Emphasises software engineering principles. Encourages a disciplined approach to building reusable libraries of software components. Case studies are used throughout the book to introduce new ideas, illustrate important concepts, and demonstrate how existing techniques work together. Case studies include: An interactive calculator programme. A coding and decoding system. A small queue simulation package. Companion website contains supporting material (such as visualisation tools and a substantial number of web links) to aid further study. Appendices contain information on Hugs errors.