Using Javascript in today's world
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The document discusses the various applications of JavaScript in web development, server-side programming, and mobile applications, highlighting popular libraries and frameworks such as YUI, jQuery, and Node.js. It emphasizes when to use these tools based on project requirements and offers examples, including callbacks and server creation in Node.js. Additionally, it mentions desktop applications and exotic use cases for JavaScript, while providing resources for further exploration.
Using Javascript in today's world
- 1. Using JavaScript in Today’s World Sudar Muthu Research Engineer GO BIG! Yahoo! Labs http://sudarmuthu.com http://twitter.com/sudarmuthu
- 3. World’s most popular programming language Douglas Crockford - http://javascript.crockford.com/popular.html
- 4. World’s most misunderstood programming language Douglas Crockford - http://javascript.crockford.com/popular.html
- 5. Who am I? To talk about JavaScript
- 6. Fan of Douglas Crockford http://wp.me/p4WjA-pe
- 7. The JavaScript wedding invitation guy ;) http://wp.me/p4WjA-rK
- 8. Using JavaScript in the browser
- 9. Options • YUI • jQuery • MooTools • Backbone.js • Knockout.js • .. and a million others
- 10. When to use YUI • You already know what JavaScript is • To build full-fledged websites that have numerous components with interdependent dependencies • You need lot of build-in widgets • Need to use design patterns • Need to have a maintainable code
- 11. When to use jQuery • If you are new to JavaScript • Want something that is light • Have a simple website with lesser number of components • Need a quick solution and want something that is easier to learn
- 12. When to use backbone.js • Decouple data from the UI • Use a full fledged MVC in the client side as well • Want to have multiple views/clients (mobile, desktop, tablets etc) • You have a clear understanding of JavaScript and also the MVC concepts
- 13. Other special purpose libraries • Lime.js – HTML5 based game framework • Processing.js – Data visualizations and interactive animations • flot – JavaScript plotting library • Raphael – Vector graphics library
- 14. Using JavaScript in the server
- 15. Why JavaScript on the server • Homogenous Programming Experience • Easy meta programming • Easy reflection • Object literals • Interpreted Langauge
- 16. What is node.js • Event-driven • Non-blocking I/O • Asynchronous • Single-threaded • Light weight and efficient
- 17. Why node.js Code like this var result = db.query("select.."); // use result either blocks the entire process or implies multiple execution stacks (threads).
- 18. Why node.js But a line of code like this db.query("select..", function (result){ // use result }); allows the program to return to the event loop immediately. No more unnecessary threads.
- 19. Demo
- 20. Demo of callback // execute the callback after 2 seconds setTimeout(function () { console.log("World!"); }, 2000); // print in console console.log("Hello"); https://github.com/sudar/jsfoo/blob/master/callback.js
- 21. Demo of a server in node.js var http = require('http'); // require the http module // create a server http.createServer(function (req, res) { // call this function when a request is received res.writeHead(200, { 'Content-Type': 'text/plain' }); // send this as part of the response res.end('Hello Worldn'); }).listen(1337, "127.0.0.1"); // listen on port 1337 // debug information console.log('Server running at http://127.0.0.1:1337/'); https://github.com/sudar/jsfoo/blob/master/http-server.js
- 22. When to use node.js • Writing highly concurrent server applications • Sharing application logic between server and client • Peer-to-peer web applications using websockets • And node.js is available in Azure
- 23. Other options to consider • Rhino • Spidermonkey • Narwhal • Nitro
- 24. Using JavaScript in mobile applications
- 25. PhoneGap HTML5 app platform that allows you to write native mobile applications using web technologies like HTML and JavaScript Yes it works in Windows Phone 7 as well
- 26. When to use it? If you need to have one code base and develop mobile applications for • Android • iOS • Blackberry • Window Phone • etc
- 27. Using JavaScript in desktop applications
- 28. Some options to consider • Windows metro apps • Yahoo Konfabulator • Cappuccino • Titanium • Couch DB
- 29. Other exoctic use cases • Control USB hid devices – node-hid • Control Serial devices – node- serialport • Control Arduino – noduino • Control Powerpoint presentations
- 30. Well, it’s all fine, but I don’t like JavaScript Syntax
- 32. Demo
- 33. Questions Sudar Muthu http://sudarmuthu.com http://twitter.com/sudarmuthu