INTRODUCTION

Hi, I’m @bkeepers

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nodejs.org Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non- blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

server side JavaScript

$ node webserver.js var http = require('http'), server = http.createServer(); server.on('request', function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }); server.listen(1337, "127.0.0.1"); console.log('Server running at http://127.0.0.1:1337/'); webserver.js

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event loop modules package management

non-blocking evented I/O

event driven

event driven Button

event driven Button

event driven Button $('button').on('click', function(event) { alert('Event Driven!') });

event driven server.on('request', function(req, res) { res.write(handleRequest(req)) });

non-blocking

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// blocking var files = fs.readdirSync('/tmp') for(var i = 0; i < files.length; i++) { var file = files[i]; fs.unlinkSync('/tmp/' + file); console.log('successfully deleted ' + file); }

// blocking var files = fs.readdirSync('/tmp') for(var i = 0; i < files.length; i++) { var file = files[i]; fs.unlinkSync('/tmp/' + file); console.log('successfully deleted ' + file); } // non-blocking fs.readdir('/tmp', function(err, files) { for(var i = 0; i < files.length; i++) { var file = files[i]; fs.unlink('/tmp/' + file, function (err) { if (err) throw err; console.log('successfully deleted ' + file); }); } });

CommonJS modules

JavaScript Pollutes

JavaScript Pollutes string = "pollution";

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var http = require('http');

hello.js module.exports = function() { return 'Hello World' };

$ node myapp.js myapp.js var hello = require('./hello.js'); console.log(hello());

package management

npmjs.org

$ npm install

package.json

package.json $ npm install { "name": "myapp", "version": "0.0.1", "dependencies": { "socket.io": "0.8.7", "coffee-script": "1.2.0", "spine": "~1.0.5" } }

building the simplest chat app in the world demo

references

http://nodejs.org/api/

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thanks! @bkeepers