book

Kotlin Cookbook

Name: Kotlin Cookbook
Author: Ken Kousen
ISBN: 9781492046639

by Ken Kousen

November 2019

Intermediate to advanced

254 pages

4h 55m

English

O'Reilly Media, Inc.

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Foreword
Preface
Who Should Read This BookHow This Book Is OrganizedConventions Used in This BookUsing Code ExamplesO’Reilly Online LearningHow to Contact UsAcknowledgments
1. Installing and Running Kotlin
1.1. Running Kotlin Without a Local Compiler1.2. Installing Kotlin Locally1.3. Compiling and Running Kotlin from the Command Line1.4. Using the Kotlin REPL1.5. Executing a Kotlin Script1.6. Building a Standalone Application Using GraalVM1.7. Adding the Kotlin Plug-in for Gradle (Groovy Syntax)1.8. Adding the Kotlin Plug-in for Gradle (Kotlin Syntax)1.9. Using Gradle to Build Kotlin Projects1.10. Using Maven with Kotlin
2. Basic Kotlin
2.1. Using Nullable Types in Kotlin2.2. Adding Nullability Indicators to Java2.3. Adding Overloaded Methods for Java2.4. Converting Between Types Explicitly2.5. Printing to Different Bases2.6. Raising a Number to a Power2.7. Using Bitwise Shift Operators2.8. Using Bitwise Boolean Operators2.9. Creating Pair Instances with to
3. Object-Oriented Programming in Kotlin
3.1. Understanding the Difference Between const and val3.2. Creating Custom Getters and Setters3.3. Defining Data Classes3.4. The Backing Property Technique3.5. Overloading Operators3.6. Using lateinit for Delayed Initialization3.7. Using Safe Casting, Reference Equality, and Elvis to Override equals3.8. Creating a Singleton3.9. Much Ado About Nothing
4. Functional Programming
4.1. Using fold in Algorithms4.2. Using the reduce Function for Reductions4.3. Applying Tail Recursion
5. Collections
5.1. Working with Arrays5.2. Creating Collections5.3. Creating Read-Only Views from Existing Collections5.4. Building a Map from a Collection5.5. Returning a Default When a Collection Is Empty5.6. Restricting a Value to a Given Range5.7. Processing a Window on a Collection5.8. Destructuring Lists5.9. Sorting by Multiple Properties5.10. Defining Your Own Iterator5.11. Filtering a Collection by Type5.12. Making a Range into a Progression
6. Sequences
6.1. Using Lazy Sequences6.2. Generating Sequences6.3. Managing Infinite Sequences6.4. Yielding from a Sequence
7. Scope Functions
7.1. Initializing Objects After Construction with apply7.2. Using also for Side Effects7.3. Using the let Function and Elvis7.4. Using let with a Temporary Variable
8. Kotlin Delegates
8.1. Implementing Composition by Delegation8.2. Using the lazy Delegate8.3. Ensuring That a Value Is Not Null8.4. Using the observable and vetoable Delegates8.5. Supplying Maps as Delegates8.6. Creating Your Own Delegates

9. Testing
9.1. Setting the Test Class Life Cycle9.2. Using Data Classes for Tests9.3. Using Helper Functions with Default Arguments9.4. Repeating JUnit 5 Tests with Different Data9.5. Using Data Classes for Parameterized Tests
10. Input/Output
10.1. Managing Resources with use10.2. Writing to a File
11. Miscellaneous
11.1. Working with the Kotlin Version11.2. Executing a Lambda Repeatedly11.3. Forcing when to Be Exhaustive11.4. Using the replace Function with Regular Expressions11.5. Converting to Binary String and Back11.6. Making a Class Executable11.7. Measuring Elapsed Time11.8. Starting Threads11.9. Forcing Completion with TODO11.10. Understanding the Random Behavior of Random11.11. Using Special Characters in Function Names11.12. Telling Java About Exceptions
12. The Spring Framework
12.1. Opening Spring-Managed Bean Classes for Extension12.2. Persisting Kotlin Data Classes12.3. Injecting Dependencies
13. Coroutines and Structured Concurrency
13.1. Choosing Coroutine Builders13.2. Replacing async/await with withContext13.3. Working with Dispatchers13.4. Running Coroutines on a Java Thread Pool13.5. Cancelling Coroutines13.6. Debugging Coroutines
Index

Overview

Use Kotlin to build Android apps, web applications, and more—while you learn the nuances of this popular language. With this unique cookbook, developers will learn how to apply thisJava-based language to their own projects. Both experienced programmers and those new to Kotlin will benefit from the practical recipes in this book.

Author Ken Kousen (Modern Java Recipes) shows you how to solve problems with Kotlin by concentrating on your own use cases rather than on basic syntax. You provide the contextand this book supplies the answers. Already big in Android development, Kotlin can be used anywhere Java is applied, as well as for iOS development, native applications, JavaScriptgeneration, and more. Jump in and build meaningful projects with Kotlin today.

Apply functional programming concepts, including lambdas, sequences, and concurrency
See how to use delegates, late initialization, and scope functions
Explore Java interoperability and access Java libraries using Kotlin
Add your own extension functions
Use helpful libraries such as JUnit 5
Get practical advice for working with specific frameworks, like Android and Spring

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