Using Javascript in today's world
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A brief about different JavaScript frameworks and some suggestions on when to use each one of them. More details at http://sudarmuthu.com/blog/slides-from-my-talk-about-using-javascript-at-teched
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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