Node.js - A practical Introduction

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A practical introduction 15.06.2012 - Big Tech Day 5, Munich Felix Geisendörfer

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Felix Geisendörfer

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transloadit.com

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core contributor

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npm modules

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node-formidable

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node-mysql

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~50 modules total

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(@)felixge(.de)

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Audience

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Software Developers?

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JavaScript Developers?

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Heard about node.js?

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Using node.js?

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What is node.js?

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JavaScript on the Server

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Hello World

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1 var http = require('http'); 2 3 http.createServer(function(req, res) { 4 res.end('Hello World'); 5 }).listen(8080); hello world http server in node.js

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Features • TCP / UDP • HTTP / HTTPS • File System • Buffers (byte arrays) • DNS • Child Processes • Http / Https • Crypto • ZLIB • Readline / TTY / REPL

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< 5 min to install Windows, Mac, Linux

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History

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1995 LiveWire released

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1997 Rhino started

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...

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Ryan Dahl starts the node project (first commit) Feb 16, 2009

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I discovered node.js (v0.0.6) ~June, 2009

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Isaac Schlueter starts the npm package manager Sep 29, 2009

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Ryan’s talk at JSConf.EU gets people excited about node Nov 7, 2009

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...

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2012

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What is special?

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Non-blocking I/O

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var image = fs.readFileSync('some.jpeg'); console.log('hello'); vs fs.readFile('some.jpeg', function(err, image) { }); console.log('hello');

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Easy concurrency

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Low memory usage

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Good performance

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Google V8

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JS -> Assembly

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Crankshaft JIT

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Fast

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Now in Munich

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Simple Benchmark

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1 kb http responses ~6000 requests / second* * per CPU core

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Why JavaScript?

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// Today (15.06.2012) > (new Date).getMonth() 5

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> 0.3 + 0.3 + 0.3 0.8999999999999999

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Everywhere

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War on JavaScript

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No I/O in Standard Lib

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Use Cases

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WebSockets

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Streaming

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Code Sharing

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etc.

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node package manager

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10.000+ packages

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local installs

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