Mastering Kotlin helps readers quickly understand core concepts and then move on to practical projects using the Kotlin programming language.Back in the day, Java was the de facto choice for creating Android apps. However, since Google announced Kotlin as the new language of choice for building Android applications, developers haven’t looked back.Kotlin is a general purpose, statically typed, open source programming language that runs on Java Virtual Machines. It can be called a Java replacement; however, the Kotlin syntax isn’t blindly identical to that of Java. Sure, Kotlin can work with Java, and owing to its intuitiveness, it can also enhance overall productivity and efficiency, but it is not a Java clone.