Henri Binsztok - Opa: Up and Running
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Youll 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.
- Learn fundamental concepts, including Opas functional programming style
- Discover how Opa compiles to JavaScript, using jQuery on the frontend and Node.js on the server
- Construct Html resources dynamically and embed static resources on an Opa server
- Use Opas method for performing Crud operations and storing key-value pairs in MongoDb
- Build an Opa user interface with the Bootstrap toolkit from Twitter
- Learn variant types, pattern-matching, polymorphic types, recursive functions, and other advanced features
- Manage user accounts by building login forms, handling account activation, and tracking logged users
- Build a reactive Uia real-time interface that continuously updates user events
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Modern web applications represent the new way to write software. Facebook, Twitter, and Wikipedia are some well-known examples of such applications. They run on servers, and users can access them with a browser via either desktop or mobile devices. We refer to these as modern applications because they combine a rich user interface with real-time interaction and the capability to connect with online services, among other capabilities.
Opa is a programming framework for JavaScript that enables you to easily write modern web applications that have all the aforementioned cool features. This book is a gentle introduction to Opa.
Traditionally, many different technologies and languagesare involved when writing web applications. Not so with Opa! Opa is the onlytechnology you need to know to write the code that runs on theclient (in the browser) and the code that runs on the server, includingdatabase queries.
Opa natively supports the web platform, which is a set of technologies that includes HTML5 and CSS, and it automates many aspects of modern webapplication programming: Ajax/Comet client/server communication,event-driven and nonblocking code transformations, etc.
One of the main distinctive features of Opa is strong static typing,with type inference. This means that every application you write is checkedby a program called a typechecker that automatically tracksinconsistencies in the application. Typing enables Opa programmers todebug applications quickly, and increases application safety and security.
As a final step, Opa generates standard code: JavaScript for the client side,Node.js, and MongoDB for the server side.
The philosophy of Opa is to support multiple platforms. It is possible to extend Opato support different backends.
Working with Opa is as easy as 1, 2, 3:
- Write your application code in a text editor.
- Generate your application by invoking Opa.
- Run and/or deploy your application online.
In , you will learn how to install Opa and create your first application.Then you will develop two real applications with Opa: a mini-Wikipedia and a mini-Twitter.
The applications you develop with Opa are standard JavaScript projects that run both in the browser (where JavaScript is by far the most prevalent) and on the server. On the server side (also called the backend), the applications rely on two popular technologies for the runtime:
- Node.js, which allows you to execute JavaScript code on the server
- MongoDB, which is a NoSQL database server
Both technologies were chosen for their ability to scale , that is, easily add servers to handle more clients when your application becomes hugely popular.
The following typographical conventions are used in this book:
Constant width Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords Constant width bold Shows commands or other text that should be typed literally by the user Constant width italic Shows text that should be replaced with user-supplied values or by values determined by contextThis icon signifies a tip, suggestion, or general note.
This icon indicates a warning or caution.
This book is here to help you get your job done. In general, if this book includes code examples, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Opa: Up and Running by Henri Binsztok, Adam Koprowski, and Ida Swarczewskaja (OReilly). Copyright 2013 MLstate, 978-1-449-32885-6.
If you feel your use of code examples falls outside fair use or the permission given here, feel free to contact us at .
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