Book Image

Kotlin Programming Cookbook

By : Aanand Shekhar Roy, Rashi Karanpuria
Book Image

Kotlin Programming Cookbook

By: Aanand Shekhar Roy, Rashi Karanpuria

Overview of this book

The Android team has announced first-class support for Kotlin 1.1. This acts as an added boost to the language and more and more developers are now looking at Kotlin for their application development. This recipe-based book will be your guide to learning the Kotlin programming language. The recipes in this book build from simple language concepts to more complex applications of the language. After the fundamentals of the language, you will learn how to apply the object-oriented programming features of Kotlin 1.1. Programming with Lambdas will show you how to use the functional power of Kotlin. This book has recipes that will get you started with Android programming with Kotlin 1.1, providing quick solutions to common problems encountered during Android app development. You will also be taken through recipes that will teach you microservice and concurrent programming with Kotlin. Going forward, you will learn to test and secure your applications with Kotlin. Finally, this book supplies recipes that will help you migrate your Java code to Kotlin and will help ensure that it's interoperable with Java.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Creating getter setters in Kotlin


If you have worked with Java, you probably know what a getter-setter is. Java has fields and getter-setters are the methods that are used to access (getter) and modify (setter) member variables. They are an essential part of encapsulation (one of the design principles).

However, in Kotlin, we don't have any fields, but we have properties instead. A property can have a custom implementation of an accessor and a mutator. In this recipe, we will see how we can implement custom accessors and mutators.

Getting ready

We will be using IntelliJ IDEA to write and execute our code. You can use whatever development environment you are comfortable with. We will be using examples to understand the custom getter-setters of Kotlin.

How to do it...

Let's follow these steps to understand how custom getter-setters work in Kotlin:

  1. The syntax of a Kotlin property looks like this:
var<propertyName>[: <PropertyType>] [=<property_initializer>]  [<getter>]  [&lt...