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JavaScript is important. That wasn’t always so, but it’s true now. JavaScript has become one of the most important and most widely used programming languages today. Web applications are expected to give users a rich user interface experience, and without JavaScript, you might as well just be showing pictures of kittens. More than ever, web developers need to have a sound grasp of the language that brings life to web applications. And like orange juice and breakfast, JavaScript isn’t just for browsers anymore. The language has long ago knocked down the walls of the browser and is being used on the server thanks to Node.js, on desktop devices and mobiles through platforms such as Apache Cordova, and even on embedded devices with Espruino and Tessel. Although this book is primarily focused on JavaScript executed in the browser, the fundamentals of the language presented in this book are applicable across the board. Truly understanding the concepts and learning various tips and tricks will make you a better all-around JavaScript developer. With more and more developers using JavaScript in an increasingly JavaScript world, it’s more important than ever to grasp its fundamentals so you can become an expert ninja of the language.