Book Image

Mastering Kotlin

By : Nate Ebel
Book Image

Mastering Kotlin

By: Nate Ebel

Overview of this book

Using Kotlin without taking advantage of its power and interoperability is like owning a sports car and never taking it out of the garage. While documentation and introductory resources can help you learn the basics of Kotlin, the fact that it’s a new language means that there are limited learning resources and code bases available in comparison to Java and other established languages. This Kotlin book will show you how to leverage software designs and concepts that have made Java the most dominant enterprise programming language. You’ll understand how Kotlin is a modern approach to object-oriented programming (OOP). This book will take you through the vast array of features that Kotlin provides over other languages. These features include seamless interoperability with Java, efficient syntax, built-in functional programming constructs, and support for creating your own DSL. Finally, you will gain an understanding of implementing practical design patterns and best practices to help you master the Kotlin language. By the end of the book, you'll have obtained an advanced understanding of Kotlin in order to be able to build production-grade applications.
Table of Contents (25 chapters)
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Section 1: Kotlin – A Modern Solution to Application Development
Section 2: Putting the Pieces Together – Modeling Data, Managing State, and Application Architecture
Section 3: Play Nice – Integrating Kotlin With Existing Code
Section 4: Go Beyond – Exploring Advanced and Experimental Language Features
Section 5: The Wide World of Kotlin – Using Kotlin across the Entire Development Stack


Functions are an important feature within Kotlin, and are considered first-class citizens of the language. Kotlin functions can be defined outside of any enclosing class as top-level functions, and can be passed to, and returned from, other functions. These traits make functional programming much more accessible within Kotlin than in other JVM languages. Additionally, functions in Kotlin reduce boilerplate and increase flexibility by providing features such as default parameter values and named arguments, which allow us to reduce the number of overloaded functions we must define.

We can also define a number of different types of functions depending on our current use cases. Extension functions allow us to modify or extend classes and APIs that we may not control, and enable us to decouple low-level components from other helper functions. Top-level functions reduce the...