Concurrency in Kotlin: Asynchronous Programming and Coroutines

Modern applications must be fast, responsive, and use resources efficiently. The book "Concurrency in Kotlin" is a practical guide that will help you master one of the most powerful aspects of the Kotlin language — asynchronous and concurrent programming using coroutines.

Unlike classic threads, coroutines allow you to write asynchronous code that looks synchronous. You will get rid of "callback hell" and complex thread management, getting instead clean, readable, and predictable code.

Who is this book for?

• Kotlin developers (Android, backend, multiplatform) who want to improve the performance of their applications.
• Java developers transitioning to Kotlin and wanting to understand the modern approach to concurrency.
• Students and beginner programmers familiar with the basics of Kotlin and wanting to delve deeper into the topic of multitasking.

What will you learn?

• Coroutine basics: what are coroutines, dispatchers, contexts, and scopes.
• Building asynchronous flows: using async/await, launch, and managing the coroutine lifecycle.
• Channels: data exchange between coroutines, producers and consumers.
• Flow: reactive cold and hot streams for processing data sequences.
• Error handling: strategies for catching exceptions in a concurrent environment, supervisors, and CoroutineExceptionHandler.
• Testing: how to write unit tests for coroutines using runTest and virtual time.
• Advanced topics: structured concurrency, coroutine cancellation, interaction with Java threads and RxJava.

Each chapter contains practical examples ready to use in real projects. You will learn to design systems that do not block the main thread, efficiently use CPU time, and scale easily.

The book is written in clear language with an emphasis on practice. After reading it, you will be able to confidently apply coroutines in your Kotlin projects — whether it's a server application on Ktor, an Android app, or a multiplatform module.

Master concurrency in Kotlin and make your applications faster and more reliable!