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Kotlin Programming: From Fundamentals to Advanced Mastery

A Complete Reference for Modern Application Development

This book is 100% completeLast updated on 2026-07-13
Steve T. Publications

Master Kotlin from the ground up with a practical guide that takes you from core language fundamentals to advanced development techniques. Packed with clear explanations, real-world examples, and modern best practices, this book helps you build clean, efficient, and maintainable applications with confidence.

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About the Book

Kotlin is a modern, pragmatic programming language that combines the elegance of functional programming with the practicality of object-oriented design. This book takes you from your very first line of Kotlin code through advanced topics including coroutines, multiplatform development, and production-ready architecture patterns. Whether you are a student learning to program, an educator building a curriculum, or a professional developer expanding your toolkit, this comprehensive reference provides the knowledge and practical examples you need to write idiomatic, performant, and maintainable Kotlin applications.

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About the Author

Steve T. Publications

Steve T. is a technology professional with over 20 years of experience spanning software development, server infrastructure operations, cybersecurity, vulnerability research and reverse engineering. Throughout his career, he has built extensive expertise in designing, securing, analyzing and testing complex systems with a strong focus on identifying and understanding software and infrastructure vulnerabilities.

He currently serves in the advanced research organization of a leading cybersecurity company where he conducts advanced cybersecurity and vulnerability research alongside a team of highly skilled researchers and engineers. His work focuses on discovering and analyzing security vulnerabilities, reverse engineering software and malware, evaluating emerging threats and developing innovative techniques to strengthen the security and resilience of modern computing environments.

Outside of his professional responsibilities, Steve is passionate about sharing knowledge with the global technology community. In his free time, he collaborates with fellow researchers, industry experts and technology professionals to write practical, in-depth technical books covering a broad range of IT disciplines, including software development, cybersecurity, cloud computing, networking, DevOps, artificial intelligence and enterprise technologies.

His publications are designed to make complex technical concepts accessible through clear explanations, real-world examples, and hands-on guidance. Drawing on more than two decades of industry experience, Steve is committed to helping IT professionals, students, educators and technology enthusiasts develop practical skills and stay current with the rapidly evolving technology landscape.

Contents

Table of Contents

A Complete Reference for Modern Application Development

Introduction: Why Kotlin Matters

Chapter 1: History, Philosophy, and Getting Started

  1. The Origins of Kotlin
  2. Kotlin’s Design Philosophy
  3. Installation and Development Environment
  4. Running Project Introduction: TaskTracker
  5. Your First Kotlin Program
  6. Project Structure and Build Tools
  7. Chapter 1 Summary

Chapter 2: Language Fundamentals

  1. Variables and Type Inference
  2. Data Types and Literal Notation
  3. Operators and Expressions
  4. Strings and String Templates
  5. Control Flow Structures
  6. Chapter 2 Summary

Chapter 3: Functions and Scope

  1. Function Declaration and Parameters
  2. Default and Named Arguments
  3. Higher-Order Functions and Lambdas
  4. Inline Functions and Reified Types
  5. Extension Functions
  6. Chapter 3 Summary

Chapter 4: Object-Oriented Programming in Kotlin

  1. Classes and Objects
  2. Properties and Constructors
  3. Inheritance and Open Classes
  4. Interfaces and Abstract Classes
  5. Data Classes, Sealed Classes, and Enums
  6. NoteApp Project: Class Design Evolution
  7. Chapter 4 Summary

Chapter 5: Null Safety and Type System

  1. Nullable and Non-Nullable Types
  2. Safe Calls and the Elvis Operator
  3. Smart Casts and Type Checks
  4. Platform Types from Java Interop
  5. Designing APIs with Null Safety
  6. Chapter 5 Summary

Chapter 6: Collections and Functional Operations

  1. Lists, Sets, and Maps
  2. Mutable and Immutable Collections
  3. Filtering, Mapping, and Reducing
  4. Sequences for Lazy Evaluation
  5. Collection Transformation Pipelines
  6. TaskTracker: Collection Operations in Practice
  7. Chapter 6 Summary

Chapter 7: Generics and Advanced Types

  1. Generic Classes and Functions
  2. Declaration-Site Variance (in/out)
  3. Type Projections and Star-Projections
  4. Reified Type Parameters
  5. Generic Constraints and Where Clauses
  6. TaskTracker: Generics in the Repository Layer
  7. Chapter 7 Summary

Chapter 8: Coroutines and Concurrency

  1. Understanding Coroutines
  2. Coroutine Builders and Scopes
  3. Structured Concurrency
  4. Channels, Flows, and StateFlow
  5. Exception Handling and Cancellation
  6. Structured Concurrency Hierarchy
  7. Flow vs Channel vs StateFlow Comparison
  8. Under the Hood: How Suspension Works
  9. NoteApp: Coroutines and Flow Integration
  10. Coroutine Memory and Performance Considerations
  11. Chapter 8 Summary

Chapter 9: Advanced Language Features

  1. Annotations and Meta-Annotations
  2. Reflection and Type References
  3. Delegation Pattern
  4. Inline Classes and Value Classes
  5. Domain-Specific Languages (DSLs)
  6. Chapter 9 Summary

Chapter 10: Error Handling, Testing, and File I/O

  1. Exceptions and Try-Catch
  2. Result Type and Functional Error Handling
  3. Unit Testing with JUnit 5 and MockK
  4. Property-Based Testing with Kotest
  5. File I/O and Serialization
  6. TaskTracker: Integration Testing with Serialization
  7. Chapter 10 Summary

Chapter 11: Interoperability, Performance, and Optimization

  1. Calling Java from Kotlin
  2. Calling Kotlin from Java
  3. JVM Annotations for Interop
  4. Memory Management and Optimization
  5. Benchmarking Methodology with JMH and kotlinx-benchmark
  6. K2 Compiler Performance Analysis
  7. JVM Garbage Collection Tuning for Coroutine-Heavy Applications
  8. Performance Comparison Tables
  9. Kotlin-to-Java Bytecode Mapping
  10. Chapter 11 Summary

Chapter 12: Multiplatform Development and Android

  1. Kotlin Multiplatform Architecture
  2. Shared Code and Platform-Specific Implementation
  3. Compose Multiplatform
  4. Android Development with Kotlin
  5. Ktor for Backend Services
  6. KMP Source-Set Dependency Graph
  7. TaskTracker: Complete KMP Project Structure
  8. Compose Multiplatform Deep Dive
  9. Chapter 12 Summary

Chapter 13: Best Practices, Design Patterns, and Real-World Use Cases

  1. Kotlin Coding Conventions
  2. Common Pitfalls and Anti-Patterns
  3. Creational Design Patterns in Kotlin
  4. Structural and Behavioral Patterns
  5. Real-World Architecture Examples
  6. Clean Architecture Layer Interactions
  7. NoteApp: Complete Architecture Integration
  8. Chapter 13 Summary

Conclusion: The Kotlin Ecosystem and What’s Next

References

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