Concurrency in TypeScript

The book "Concurrency in TypeScript" is a practical guide to writing efficient, fast, and responsive code in TypeScript. In modern web development, the ability to manage multiple tasks simultaneously is not a luxury but a necessity. Network delays, processing large data arrays, working with the user interface — all of this requires a deep understanding of asynchrony and concurrency.

The author, Alexey Volkov, an experienced developer and architect, will guide you step by step from the basics to advanced techniques. You will start with fundamental concepts: the event loop, callbacks, and promises. Then you will move on to the syntactic sugar of async/await, learn how to handle errors and create chains of asynchronous operations. Special attention is paid to practical scenarios: loading data from a server, managing application state, working with timers and events.

The book is not limited to theory. You will learn how to use Web Workers for true parallelism in the browser, get acquainted with the RxJS library for reactive programming, and master concurrency control patterns (queues, semaphores, thread pools). Separate chapters are devoted to testing asynchronous code and performance optimization. All examples are written in TypeScript with full typing, making them safe and easily portable to real-world projects.

Who this book is for:

• Frontend and backend developers using TypeScript or JavaScript;
• Programmers transitioning from synchronous languages (Java, Python) to the asynchronous paradigm;
• Developers who want to build fast web applications without interface freezes;
• Students and beginners looking to delve into modern programming.

What you will learn:

• How the event loop works in JavaScript and Node.js;
• Promises, async/await, and error handling in asynchronous code;
• Creating Web Workers and exchanging data between threads;
• Reactive programming with RxJS (Observable, Subject, operators);
• Concurrency patterns: Race, All, Queue, Throttle, Debounce;
• Testing asynchronous code with Jest and Mocha;
• Profiling and optimizing the performance of TypeScript applications.

The book contains many ready-to-use examples that you can immediately apply in your projects. You will gain not only theoretical knowledge but also the practical skills needed to build high-load and responsive applications in TypeScript.