Java to Kotlin: A Refactoring Guidebook 1st Edition

Kotlin is a really nice language but is not so common that you have the opportunity to start writing software from scratch, not professionally anyway. This book describes in a really good way how you transform your existing Java code base to Kotlin, step by step, concept by concept. It is pedagogical, mixing the rational behind what you want to accomplish (immutability for instance) and then it shows how to transform the Java example to Kotlin.Highly recommended.

This book is not for those new to Kotlin but it is probably the best book for learning how to write Koltin. Much of what was best practice in Java no longer applies in Kotlin because it doesn't have the heavy handed OOP restrictions on it that Java has and is more of a hybrid language allowing OOP, FP, and DOP to all merge.

Not for those that want to learn Kotlin's basics.

As the authors describe in the book, every language has its own grain and so does Kotlin. Kotlin although promoted as a better Java is so much more. It has its own grain, its own idioms.This is a book for all levels of developers that would like to try Kotlin and especially for people coming from Java.Make no mistake though! This book has, also, its own grain and its not simply a java to kotlin book. You will delve into TDD, functional programming and a plethora of refactoring techniques that you will be able to use day in day out.Do not falter and buy this book as fast as possible!