Grokking Simplicity. Taming complex software with functional thinking

Developers rightly fear the unintended complexity that infects most code. This book shows you how to write software that keeps complexity close to its inherent minimum. As you write software you should distinguish between code that alters your system's state, and code that does not. Once you learn to make that distinction, you can refactor much of your state-altering "actions" into stateless "calculations." Your software will be simpler.
The book also teaches you to solve the complex timing bugs that inevitably creep into asynchronous and multithreaded code. In advanced sections of the book you learn how composable abstractions help avoid repeating code and open up new levels of expressivity. What's Inside Patterns for simpler code. Powerful time modeling approaches to simplify asynchronous code. How higher-order functions can make code reusable and composable.
For intermediate and advanced developers building complex software. Exercises, illustrations, self-assessments, and hands-on examples lock in each new idea.