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Kotlin Quick Start Guide

By : Marko Devcic

Buy this Book

Kotlin Quick Start Guide

By: Marko Devcic

Buy this Book

Overview of this book

Kotlin is a general purpose, object-oriented language that primarily targets the JVM and Android. Intended as a better alternative to Java, its main goals are high interoperability with Java and increased developer productivity. Kotlin is still a new language and this book will help you to learn the core Kotlin features and get you ready for developing applications with Kotlin. This book covers Kotlin features in detail and explains them with practical code examples.You will learn how to set up the environment and take your frst steps with Kotlin and its syntax. We will cover the basics of the language, including functions, variables, and basic data types. With the basics covered, the next chapters show how functions are first-class citizens in Kotlin and deal with the object-oriented side of Kotlin. You will move on to more advanced features of Kotlin. You will explore Kotlin's Standard Library and learn how to work with the Collections API. The book finishes by putting Kotlin in to practice, showing how to build a desktop app. By the end of this book, you will be confident enough to use Kotlin for your next project.

Preface

Who this book is for

What this book covers

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Free Chapter

Introducing Kotlin

Compiling and running Kotlin

Kotlin's uses

Java interoperability

Build tools

Setting up the development environment

Summary

Kotlin Basics

Functions

Local variables

Local functions

Type inference

Basic types

Nullable types

Casting

Control flow

Exceptions

Packages

Visibility modifiers

Summary

Classes and Object-Oriented Programming

Classes

Properties

Class constructors

Nested classes

Enum classes

Data classes

Inheritance

Overriding members

Abstract classes

Interfaces

Interfaces versus abstract classes

Object keyword

Class delegation

Sealed classes

Smart casts

Summary

Functions and Lambdas

Advanced functions

Lambdas

Function types

Summary

Advanced Kotlin

Generics

Concurrency constructs

Delegated properties

Extension functions

Extension properties

Receiver functions

Infix functions

Building a simple DSL

Operator overloading

Summary

Kotlin Standard Library

Collections

Working with collections

Kotlin standard library functions

Summary

Coding a Dictionary App with Kotlin

Project setup

Developing the dictionary app

Summary

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Functions and Lambdas

This chapter is dedicated to functions. First, we'll see some more advanced features of functions in Kotlin that we've not covered in Chapter 2, Kotlin Basics. Then, the rest of the chapter is dedicated to function types and lambdas. Lambdas and function types are an essential part of Kotlin, and the standard library relies on and uses them extensively.

In this chapter, we will cover the following: