What makes Closure different from other libraries available nowadays is its goal, its structure and its approach to client side developing with JavaScript. [...] Coding in Closure means thinking with object oriented principles in mind, create several js files, each representing a single class (customer.js, mediaplayer.js, loader.js and similar), organize the application architecture into packages and finally deploying it using the tools provided, obtaining a single, compressed, and safe JavaScript file which run extremely faster and doesn't contain dead code (unused functions and objects).