Are you looking If so, this book is for you. Object-oriented programming is a programming method that takes objects as the foundation for building algorithms and building programs. This book introduces OOP concepts like encapsulation, classes and instance, object inheritance, etc. and guides you how to do OOP in JavaScript. The book targets intermediate developers who already know basic JavaScript programming. It starts from introducing all concepts that related to OOP. Then, Object-Oriented Programming in JavaScript will be introduced in the last chapter when you knew all related concepts. JavaScript is the World's Most-Used Programming Language, that is one of the core technologies of the World Wide Web, alongside HTML and CSS. Websites use JavaScript on the client side for web page behavior and user interaction.