You want increased customer satisfaction faster development cycles and less wasted work. Domaindriven design DDD combined with functional programming is the innovative combo that will get you there. In this pragmatic downtoearth guide youll see how applying the core principles of functional programming can result in software designs that model realworld requirements both elegantly and concisely often more so than an objectoriented approach. Practical examples in the opensource F functional language and examples from familiar business domains show you how to apply these techniques to build software that is businessfocused flexible and high quality. Domaindriven design is a wellestablished approach to designing software that ensures that domain experts and developers work together effectively to create highquality software. This book is the first to combine DDD with techniques from statically typed functional programming. This book is perfect for newcomers to DDD or functional programming all the techniques you need will be introduced and explained. Model a complex domain accurately using the F type system creating compilable code that is also readable documentationensuring that the code and design never get out of sync. Encode business rules in the design so that you have compiletime unit tests and eliminate many potential bugs by making illegal states unrepresentable. Assemble a series of small testable functions into a complete use case and compose these individual scenarios into a largescale design. Discover why the combination of functional programming and DDD leads naturally to serviceoriented and hexagonal architectures. Finally create a functional domain model that works with traditional databases NoSQL and event stores and safely expose your domain via a website or API. Solve real problems by focusing on realworld requirements for your software. What You Need The code in this book is designed to be run interactively on Windows Mac and Linux. You will need a