High level asynchronous programming with Reactive Extensions is a comprehensive guide to understanding and implementing asynchronous programming using Reactive Extensions (Rx), a powerful library for composing and manipulating sequences of events.

The book covers the fundamental concepts of reactive programming and how to apply them to build high-performance and scalable applications. It delves into the core concepts of Rx, such as observables, observers, subscriptions, and operators, and provides a detailed overview of how to use them to build reactive applications.

The first part of the book introduces the basics of Rx programming, including how to create observables and observers, how to handle errors, and how to use Rx operators to manipulate streams of data. The second part focuses on advanced Rx concepts, including how to use Rx to handle concurrency, how to create custom operators, and how to integrate Rx with other asynchronous libraries and frameworks.

Throughout the book, the author provides real-world examples and practical advice for building reactive applications. The examples are written in C# and illustrate how to use Rx to build applications for a variety of platforms and use cases, including web applications, desktop applications, and mobile applications.

One of the key benefits of using Rx is that it provides a unified way to handle asynchronous programming across different platforms and programming languages. The book explores how Rx can be used with a variety of programming languages, including C#, Java, and JavaScript, and how it can be used with different frameworks, such as .NET, Java EE, and Node.js.

Whether you are a seasoned developer looking to expand your knowledge of asynchronous programming or a beginner looking to learn the basics of reactive programming, High level asynchronous programming with Reactive Extensions is an essential resource for anyone interested in building high-performance and scalable applications.