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Learn Kotlin Programming

Learn Kotlin Programming

By : Stephen Samuel, Stefan Bocutiu
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Learn Kotlin Programming

Learn Kotlin Programming

By: Stephen Samuel, Stefan Bocutiu

Overview of this book

Kotlin is a general-purpose programming language used for developing cross-platform applications. Complete with a comprehensive introduction and projects covering the full set of Kotlin programming features, this book will take you through the fundamentals of Kotlin and get you up to speed in no time. Learn Kotlin Programming covers the installation, tools, and how to write basic programs in Kotlin. You'll learn how to implement object-oriented programming in Kotlin and easily reuse your program or parts of it. The book explains DSL construction, serialization, null safety aspects, and type parameterization to help you build robust apps. You'll learn how to destructure expressions and write your own. You'll then get to grips with building scalable apps by exploring advanced topics such as testing, concurrency, microservices, coroutines, and Kotlin DSL builders. Furthermore, you'll be introduced to the kotlinx.serialization framework, which is used to persist objects in JSON, Protobuf, and other formats. By the end of this book, you'll be well versed with all the new features in Kotlin and will be able to build robust applications skillfully.
Table of Contents (21 chapters)
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Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Section 1: Fundamental Concepts in Kotlin
Section 1: Fundamental Concepts in Kotlin
2
Getting Started with Kotlin
Getting Started with Kotlin
Technical requirements
Using the command line to compile and run Kotlin code
Kotlin runtime
The REPL
Kotlin for scripting
Kotlin with Gradle
Kotlin with Maven
IntelliJ and Kotlin
Eclipse and Kotlin
Mixing Kotlin and Java in a project
Summary
3
Kotlin Basics
Kotlin Basics
val and var
Type inference
Basic types in Kotlin
Comments
Packages
Imports
String templates
Ranges
Loops
Exception handling
Instantiating classes
Referential equality and structural equality
This expression
Visibility modifiers
Control flow as expressions
The null syntax
The when expression
Type hierarchy
Code contracts
Summary
4
Object-Oriented Programming in Kotlin
Object-Oriented Programming in Kotlin
Classes
Interfaces
Inheritance
Visibility modifiers
Abstract classes
Interface or abstract classes
Polymorphism
Overriding rules
Inheritance versus composition
Class delegation
Sealed classes
Summary
5
Section 2: Practical Concepts in Kotlin
Section 2: Practical Concepts in Kotlin
6
Functions in Kotlin
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Functions in Kotlin
Defining functions
Single expression functions
Member functions
Local functions
Top-level functions
Named parameters
Default parameters
Extension functions
Operators
Function literals
Tail recursive functions
Varargs
Standard library functions
Generic functions
Pure functions
Java from Kotlin
Kotlin from Java
Summary
7
Higher-Order Functions and Functional Programming
Higher-Order Functions and Functional Programming
Higher-order functions
Closures
Anonymous functions
Function references
Function-literal receivers
Functions in the JVM
Function composition
Inline functions
Currying and partial application
Memoization
Type alias
Either
Custom DSLs
Validation and error accumulation
Summary
8
Properties
Properties
Why use properties?
Overriding getters and setters
Visibility
Late initialization
Delegated properties
Lazy initializations
Lateinit versus lazy
Observables
A non-null property delegate
Properties or methods?
Summary
9
Null Safety, Reflection, and Annotations
Null Safety, Reflection, and Annotations
Nullable types
Smart cast
Safe null access
Elvis operator
Safe casting
Optional
Reflection
Constructors
Objects and companions
Useful KClass properties
Reflective functions and properties
Annotations
Standard annotations
Runtime annotation discovery
Summary
10
Generics
Generics
Parameterized functions
Parameterized types
Bounded polymorphism
Type variance
Nothing type
Type projection
Type erasure
Type reification
Recursive type bounds
Algebraic data types
Summary
11
Data Classes
Data Classes
Introduction to data classes
Automatic creation of getters and setters
The copy method
toString out of the box
The hashCode and equals methods generated for you
Destructed declarations
Destructing types
Data class definition rules
Limitations
Summary
12
Collections
Collections
Class hierarchy
Arrays
Lists
Maps
Sets
Read-only views
Indexed access
Sequences
Summary
13
Testing in Kotlin
Testing in Kotlin
Getting started
Choosing a spec
Matchers
Inspectors
Interceptors
Project config
Property testing
Table-driven testing
Tags, conditions, and config
Summary
14
Microservices with Kotlin
Microservices with Kotlin
Definition
Drawbacks
Why microservices?
Lagom
Defining services
Implementing a Lagom service
Summary
15
Section 3: Advanced Concepts in Kotlin
Section 3: Advanced Concepts in Kotlin
16
Concurrency
Concurrency
Threads
Deadlocks and livelocks
Executors
Race conditions
Summary
17
Coroutines
Coroutines
Suspending functions
Coroutine builders
Structured concurrency
Jobs
Context and scope
Cancellation and failure
Async
Coroutine dispatchers
Error handling
Summary
18
Application of Coroutines
Application of Coroutines
Channels
select expression
Debugging coroutines
Coroutines in action
Summary
19
Kotlin Serialization
Kotlin Serialization
Setup
Json serialization and deserialization
How it works
Protobuf serialization and deserialization
Annotations
Rules
Summary
20
Other Books You May Enjoy
Other Books You May Enjoy
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Java from Kotlin

One of the main selling points for Kotlin over other alternative Java virtual machine (JVM) languages is the importance placed upon a high degree of interoperability between Kotlin and Java. Most Java code can be called without any special support, and some special cases are described here.

Getters and setters

The JavaBean convention in Java states that mutable fields have a getter and a setter, and immutable fields just have a getter. A getter is just a no-arg method named get followed by the name of the field. A setter is a single argument method named set followed by the name of the field, where the argument is the value you want to set the field to:

    public class Named { 
      private String name;...

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