Clean Code Principles and Patterns is one of the most comprehensive no-fluff guides for software developers to help them write clean code every day. The author Petri Silen has almost 30 years of industry experience in designing and implementing software, and now he puts all his knowledge gained during the years into this book. The book is packed with principles and patterns that help developers, from novices and juniors to seniors and experts, to write cleaner code. The principles and patterns presented in the book are accompanied by realistic yet straightforward examples to help the reader to understand them better. Examples are written in Java, JavaScript/TypeScript, and C++. Most of the examples are directly applicable to other programming languages, too. The reader should have basic knowledge of one object-oriented programming language to get the full benefit from this book. The source code for all major examples presented in the book is available in a public GitHub repository.