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Kotlin Essentials

Kotlin is a powerful language, largely thanks to its expressive syntax, intuitive and null-safe type system, and great tooling support. It’s no wonder that Kotlin is the most popular language for Android development and is a popular replacement for Java on backend applications. It is also used for data science and for multiplatform, iOS, desktop, and web application development.

This book covers the essentials of Kotlin so you can start developing with this amazing programming language. It shows nearly everything you need to know in clear and executable code examples.

Who this book is for

This book is for developers with experience in other programming languages. Specifically, experience with an object-oriented programming language (such as Java, JavaScript, Python, or C++) would be beneficial to the reader.

What is covered

This book focuses on the essential Kotlin features, including:

  • variables, values, and types,
  • conditional statements and loops,
  • support for nullability,
  • classes, interfaces, and inheritance,
  • object expressions and declarations,
  • data, sealed, enum, and annotation classes,
  • extension functions,
  • collections,
  • operator overloading,
  • the type system,
  • generics.
Marcin Moskała

Marcin Moskała

Marcin Moskala is a highly experienced developer and Kotlin instructor as the founder of Kt. Academy, an official JetBrains partner specializing in Kotlin training, is known for his significant contributions to the Kotlin community. Moskala is the author of several widely recognized books, including "Effective Kotlin," "Kotlin Coroutines," "Functional Kotlin," "Advanced Kotlin," "Kotlin Essentials," and "Android Development with Kotlin."

Beyond his literary achievements, Moskala is the author of the largest Medium publication dedicated to Kotlin. As a respected speaker, he has been invited to share his insights at numerous programming conferences, including events such as Droidcon and the prestigious Kotlin Conf, the premier conference dedicated to the Kotlin programming language.