Whether for building interactive browser-based applications or creating server-side applications in Node, JavaScript is the most widely used language for web programming. With new features, language improvements, paradigms, and potential use cases appearing regularly, there’s never been a more exciting time to be a JavaScript developer.   In The Joy of JavaScript, author and JavaScript expert Luis Atencio teaches you key design concepts that lead to clean, lean, modular, and easy-to-maintain code. Key features • JavaScript’s objects and module system  • Working with higher order functions  • Driving application business logic with functional programming principles  • Dynamically hooking into data with Proxy and Reflect APIs  • Static type-checking with Flow  • Taming complex asynchronous behavior using reactive programming Audience Perfect for intermediate JavaScript developers with basic familiarity with HTTP, HTML/CSS, and Git/CLI. About the technology JavaScript is multi-paradigm, supporting object-oriented, functional, reactive, and event-driven styles of programming. And transpilers like Babel make it possible to compile code written in other languages into JavaScript. Luis Atencio is a software engineer for Citrix Systems, where he develops and architects web applications leveraging Java, PHP, and JavaScript platforms. He blogs about software engineering at http://luisatencio.net, has spoken in many dev conferences, and has written articles for PHPArch magazine and DZone Refcardz. Luis is the author of Manning’s Functional Programming in JavaScript and the co-author of Manning’s RxJS in Action.