Server Side Apocalypse, JS
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The document discusses the advantages and disadvantages of using Node.js as a server-side language, emphasizing its asynchronous I/O capabilities and event-driven architecture. It includes examples of basic server creation, the use of npm for package management, and mentions notable case studies of organizations like LinkedIn that have successfully adopted Node.js. Additionally, it advises that while Node.js is effective for handling many requests, it may not perform optimally for CPU-intensive tasks.
Server Side Apocalypse, JS
- 1. Server Side Apocalypse, JS
- 2. About Me Md. Sohel Rana Founder, NerdDevs http://www.nerddevs.com twitter : @sohel023010 skype : sohel023010 http://blog.sohel.me
- 3. Client Browser A Desktop App Rest Client Server? Yes!
- 4. Server Serves data, images, files, audio, video etc. Sometimes foods as well! Foodpanda J
- 5. Server Side Scripting ASP, ASP.NET, Java, PHP, Haskell, Perl, Python, Ruby and so on! And also JavaScript JavaScript brought non-blocking IO It changed the way how server works We got NodeJS
- 6. NodeJS A runtime environment to support JavaScript as server side language Built on V8-JavaScript Engine of Chrome, Fast Event-driven, non- blocking I/O
- 7. NodeJS Advantages over others - Asynchronous I/O, more request can server - JavaScript as a Server Side language - Event Driven - Callbacks - A good package manager “NPM” Disadvantages - Single threaded - Lack of standard libraries
- 8. NodeJS An http server : var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello Worldn'); }).listen(9000, '127.0.0.1'); console.log('Server running at http://127.0.0.1:9000/');
- 9. Node Modules A functional unit that performs specified actions Loaded using require(‘module_name’) Usually placed at node_modules folder Non-native modules loaded searching upwards
- 10. Node Modules A simple module : // “modules/calculator.js” exports.add = function(a, b){ return a+b ; }; exports.subtract = function(a, b){ return a-b; }; var Calculator = require('./module/calculator.js'); var addTwoNumber = Calculator.add(5,7);
- 11. NPM NPM- nodejs package manager Used for install/ uninstall node programs Can be used to install dependencies package.json is used to define dependencies //pakage.json { "name": "backbone-express-boilerplate", "version": "1.0.0", "scripts": { "start": "node ./server/bin/www" }, "dependencies": { "express": "^4.12.3", "body-parser": "~1.12.0", "cookie-parser": "~1.3.4", "jade": "~1.9.2", "serve-favicon": "~2.2.0" }, "repository": { "type": "git", "url": "https://github.com/sohel-rana/backbone- express-boilerplate.git" }, "author": "Sohel Rana”, "bugs": { "url": "https://github.com/sohel-rana/backbone- express-boilerplate/issues" }, "homepage": "https://github.com/sohel-rana/ backbone-express-boilerplate" }
- 12. Web Frameworks NodeJS provides core modules Requires lots of effort for web apps Express, Sails etc. provides lots of feature top of it Makes the project manageable
- 13. Case Studies LinkedIn moved from Rails to Node, reduced their server uses from 30 to 3 Microsoft, Walmart, eBay, Paypal all uses nodejs for some of their services And there are many more here
- 14. Throw all? Throw all other and use NodeJS? NO! NodeJS is good to handle many request. But will not perform well when we need more CPU Suitable for real-time applications Chat, online games , collaboration tools etc.