hacking with node.JS
Download as PPTX, PDF6 likes9,547 views
Node.js is an exciting new platform developed by Ryan Dahl that allows JavaScript developers to create extremely high performance servers by leveraging Google's V8 JavaScript engine and asynchronous I/O. It uses a non-blocking I/O model that makes it lightweight and efficient, as well as features like CommonJS modules and the npm package manager. The document provides examples of building simple HTTP servers and modules in Node.js to demonstrate its capabilities.
hacking with node.JS
- 2. #hacking withnode.JSHarshaVashishthttp://www.harsharv.com@harsharvPicture Source: http://bethesignal.org/blog/2011/01/06/speaking-lca2011-html5-nodejs/
- 4. Node is an exciting new platform developed byRyan Dahl.
- 5. It is a lot of sugar on v8
- 6. It allows JavaScript developers to create extremely high performance servers by leveraging Google's V8 JavaScript engine, and asynchronous I/O.
- 7. Never wait it the motto
- 8. Recap… What is Node.js?Node is an exciting new platform developed by Ryan Dahl.
- 9. It allows JavaScript developers to create extremely high performance servers by leveraging Google's V8 JavaScript engine, and asynchronous I/O.
- 10. Node is a lot of Sugar written on V8
- 11. Never wait is the motto. Either to fetch a page from the web or fetch data from a DB.let us look at…
- 12. DUCK! There will be code…Lets see cod
- 13. LAMP STACK1. Order2. Waits for the foodto be cooked3.Food is ready4. Serve
- 14. Node JS1. Order2. Places the orderwith the cook3. Immediately moves on to take the order from the next table4. Cook notifies that the food is ready5. Food is served
- 15. commonjsCommonJS is a community driven effort to standardize packaging of JavaScript libraries, known as modules. Modules written which comply to this standard provide portability between other compliant frameworks such as narwhal, and in some cases even browsers.** Conditions Apply
- 16. Why node.js?
- 18. Module/ export
- 19. ProcessRequireThis is used to specify that a module is required.Example:var operation = require(“pow”)
- 20. Module/ exportsThis is used to package JavaScript libraries and expose the functionality to be used else where.Example:exports.pow = function (a, b) { …}
- 21. processThe process object is a global object and can be accessed from anywhere.
- 22. It is an instance of EventEmitter.
- 23. Can be thought as an equivalent to Window object in the browserExamples:process.cwd()
- 24. process.exit(1)
- 25. process.argv
- 26. process.on('exit', function () { ...}process.on('uncaughtException', function (err) { …}
- 27. Simple http server/* File Name: hello-server.js *//* Include the http module. */var http = require('http');/* Create a server which accepts Request - req and returns Response - res */http.createServer(function (req, res) { /* Set the HTTP header for the response. */ res.writeHead(200, {'Content-Type': 'text/plain'}); /* End the HTTP response */res.end('Hello World\n');}).listen(9000, "127.0.0.1");/* Print a message to indicate that the server is running. */console.log('Server running at http://127.0.0.1:9000/');
- 28. Modules lets right some
- 29. Calculate power of a numberexports.pow = function (a, b) { /* Check if a number is passed. */ if (isNaN (a-0) || isNaN (b-0)) { return null; }varans = 1;for (vari = 1; i <= b; i++) {ans *= a; } return ans;}Link: https://github.com/harsharv/OpenHackDay2011/blob/master/hello-server.js
- 31. Npm – node package managernpm is the package manager for the Node JavaScript platform
- 32. It puts modules in place so that node can find them, and manages dependency conflicts intelligently.More about npmInstall NPMcurl http://npmjs.org/install.sh | shBrowse the packages of NPMhttp://search.npmjs.org/Npm basic commandsnpm search
- 33. npmls
- 34. npm install yui3
- 35. npm uninstall yui3Yui3 and node.js
Editor's Notes
- #9: Demo hello-world.js and hello-world.phpThen hello-world-2.js Actually there isn't a lot new here. But then again, there was nothing new about node either. Node uses non-blocking IO for fast scalable servers. That's been known about for years among the C community. It uses event based, single thread javascript for logic. That's exactly what the browser has. Add these together and we all see the huge splash it's made. It's the unique combination of some simple but complimentary ideas that really make these projects zing.
- #15: Re – usability of code. Give example of YUIExecute JS based on device.
- #20: Hello-server.js
- #24: Show npm search, install,ls, uninstallShow search.npmjs.orgMath.js