Intro
Table of Contents
About the Author
About the Technical Reviewer
Acknowledgments
Introduction
Chapter 1: Introduction to Kotlin
About Kotlin
It's Simple
It's Asynchronous
It's Object-Oriented
It's Functional
Ideal for Tests
Setup and Configuration of IntelliJ
Hardware Requirements
On Windows
On macOS
On Linux
Getting a Project Up and Running
Key Takeaways
Chapter 2: A Quick Tour of Kotlin
Program Elements
Literals
Variables
Expressions and Statements
Keywords
Whitespace
Operators
Blocks
Comments

Basic Types
Numbers and Literal Constants
Characters
Booleans
Arrays
Strings and String Templates
Controlling Program Flow
Using ifs
The when Statement
The while Statement
for Loops
Exception Handling
Handling Nulls
Key Takeaways
Chapter 3: Functions
Declaring Functions
Single Expression Functions
Default Arguments
Named Parameters
Variable Number of Arguments
Extension Functions
Infix Functions
Operator Overloading
Key Takeaways
Chapter 4: Types
Interfaces
Diamond Problem
Invoking Super Behavior
Classes

Constructors
Inheritance
Properties
Data Classes
Visibility Modifiers
Inheritance Modifiers
Object Declarations
Key Takeaways
Chapter 5: Higher Order Functions and Lambdas
Higher Order Functions
Lambda and Anonymous Functions
Parameters in Lambda Expressions
Closures
with and apply
Key Takeaways
Chapter 6: Collections
Arrays
Collections
Lists
Sets
Maps
Collections Traversal
Filter and Map
Key Takeaways
Chapter 7: Generics
Why Generics
Terminologies
Using Generics in Functions
Using Generics in Classes
Variance

Reified Generics
Key Takeaways
Chapter 8: Debugging
Errors
Runtime and Logic Errors
Working the Debugger
Set Breakpoints
Run the Program in Debug Mode
Analyze the Program State
Other Uses of the Debugger
Changing the Program State
Key Takeaways
Chapter 9: Unit Testing
Create the First Test
Write the Test Body
Run the Test
Iterate
Key Takeaways
Chapter 10: Writing Idiomatic Kotlin
Null Checks and Safe Casts
Data Classes
Named and Default Arguments
Named Parameters
Expressions
apply()
Extension Functions
Key Takeaways

Chapter 11: Creating a Spring Boot Project
Spring and Spring Boot
The Spring Family
Spring Initializr
Key Takeaways
Index