Why do you think this book is important for developers to read?

We know much about object-oriented programming. There are design patterns, design principles, software architectures, and ready solutions - all this forms a complete story of software design in OOP languages. But we don’t have anything equal in functional programming. There were takes on this or that for sure, but nothing that comprehensive and systematic. Authors do their best to observe separate techniques and ideas, but there is no complete story of what approaches we have in functional programming and how to apply them for real tasks