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Hands-On Reactive Programming with Clojure: Create asynchronous, event-based, and concurrent applications, 2nd Edition

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Learn how to use RxClojure to deal with stateful computations

Key Features

  • Leverage the features of Functional Reactive Programming using Clojure
  • Create dataflow-based systems that are the building blocks of Reactive Programming
  • Use different Functional Reactive Programming frameworks, techniques, and patterns to solve real-world problems

Book Description

Reactive Programming is central to many concurrent systems, and can help make the process of developing highly concurrent, event-driven, and asynchronous applications simpler and less error-prone.

This book will allow you to explore Reactive Programming in Clojure 1.9 and help you get to grips with some of its new features such as transducers, reader conditionals, additional string functions, direct linking, and socket servers. Hands-On Reactive Programming with Clojure starts by introducing you to Functional Reactive Programming (FRP) and its formulations, as well as showing you how it inspired Compositional Event Systems (CES). It then guides you in understanding Reactive Programming as well as learning how to develop your ability to work with time-varying values thanks to examples of reactive applications implemented in different frameworks. You'll also gain insight into some interesting Reactive design patterns such as the simple component, circuit breaker, request-response, and multiple-master replication. Finally, the book introduces microservices-based architecture in Clojure and closes with examples of unit testing frameworks.

By the end of the book, you will have gained all the knowledge you need to create applications using different Reactive Programming approaches.

What you will learn

  • Understand how to think in terms of time-varying values and event streams
  • Create, compose, and transform observable sequences using Reactive extensions
  • Build a CES framework from scratch using core.async as its foundation
  • Develop a simple ClojureScript game using Reagi
  • Integrate Om and RxJS in a web application
  • Implement a reactive API in Amazon Web Services (AWS)
  • Discover helpful approaches to backpressure and error handling
  • Get to grips with futures and their applications

Who this book is for

If you're interested in using Reactive Programming to build asynchronous and concurrent applications, this is the book for you. Basic knowledge of Clojure programming is necessary to understand the concepts covered in this book.

Table of Contents

  1. What is Reactive Programming?
  2. A Look at Reactive Extensions
  3. Asynchronous Programming and Networking
  4. Introduction to core.async
  5. Creating Your Own CES Framework with core.async
  6. Building a simple Clojurescript game with Javelin/Reagi
  7. The UI as a Function
  8. Futures
  9. A Reactive API to Amazon Web Services
  10. Reactive Microservices
  11. Testing Reactive Apps
  12. Concurrency Utilities in Clojure
  13. Appendix: The Algebra of Library Design
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