Part 5 Designing real-world software

In the final part of the book, we embark on a comprehensive exploration of advanced topics crucial for the development of robust, functional software systems. We delve into the complexities of multithreading and concurrency, unraveling the challenges and strategies for designing reliable concurrent code. Our focus includes understanding the nuances of IORefs, MVars, and STM TVars, and their appropriate usage in a concurrent environment. Emphasizing the role of transactional data structures and transactions in behavior modeling, we also explore the potential of Free monads as an architectural pattern for constructing versatile application frameworks.