Effective Kotlin

The book "Effective Kotlin" is a practical guide to writing high-quality, performant, and maintainable code in the Kotlin language. Unlike basic tutorials, this book focuses on best practices, idioms, and patterns that will help you avoid common mistakes and increase development efficiency.

The book is intended for developers already familiar with the basics of Kotlin or Java who want to deepen their knowledge and learn to write "production-grade" code. It will be useful both for backend developers working with Spring Boot or Ktor, and for Android developers striving for clean and performant applications.

The reader will learn: how to correctly use nullability and scope functions (let, apply, run, with), when to apply collections and sequences (Sequence), how to properly design APIs using extension functions, sealed classes, and inline functions. Special attention is paid to performance issues: bytecode analysis, lambda optimization, working with inline and value classes.

Chapter contents:
1. Basic principles and safety (null safety, immutability)
2. Idiomatic use of Kotlin (scope functions, operators)
3. Effective work with collections and sequences
4. API design (sealed classes, generics, DSL)
5. Performance (inline, value classes, bytecode optimization)
6. Multithreading and coroutines (best practices)
7. Testing and debugging

Why you should read it: This book is not a reference guide, but a collection of proven solutions from experienced Kotlin developers. It will help you move from the level of "just working code" to the level of "clean, fast, and maintainable code." Many recommendations are based on real projects and JetBrains documentation. After reading it, you will be able to write code that is easier for colleagues to read and that will run faster.