Want to simplify web development? This hands-on book shows you how to write frontend and backend code simultaneously, using the Opa framework. Opa provides a complete stack for web application development, including a web server, database engine, distribution libraries, and a programming language that compiles to JavaScript. You ll learn step-by-step how to use Opa by building two projects through the course of the book: a wiki application similar to Wikipedia, and a Twitter-like micro-blogging platform. Discover how easy it is to use Opa to develop applications with real-time updates, database interactions, and web service design. Do you have JavaScript experience? You re ready to get started.Learn fundamental concepts, including Opa s functional programming styleDiscover how Opa compiles to JavaScript, using jQuery on the frontend and Node.js on the serverConstruct HTML resources dynamically and embed static resources on an Opa serverUse Opa s method for performing CRUD operations and storing key-value pairs in MongoDBBuild an Opa user interface with the Bootstrap toolkit from TwitterLearn variant types, pattern-matching, polymorphic types, recursive functions, and other advanced featuresManage user accounts by building login forms, handling account activation, and tracking logged usersBuild a reactive UI a real-time interface that continuously updates user events"