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.

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.

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.