!SLIDE center #Dive Into

##Matt Swanson ##August 23, 2011

!SLIDE bullets #Node is…

• Build scalable network programs
• Asynchronous, event-driven
• Server-side JavaScript environment

!SLIDE bullets #Scalabe network programs

• HTTP, UDP, TCP, DNS, SSL
• Mainly used for HTTP
• Similar to Python’s Twisted

!SLIDE center ##Quick Refresher ###http://krondo.com/wp-content/uploads/2009/08/twisted-intro.html

!SLIDE center #So where’s the speedup? ##Frequent waiting in web apps

!SLIDE bullets #Server-side JavaScript

• Callbacks and events are familiar
• Lingua franca for web programming
• V8 is a really freaking fast VM

!SLIDE small @@@ javascript //hello-world.js var http = require(‘http’);

var server = http.createServer(function (req, res) {
  res.writeHead(200, {"Content-Type": "text/plain"});
  res.end("Hello Node\n");
});

server.listen(8000);

>> node hello-world.js

!SLIDE #Getting your bearings

!SLIDE #Demo ##Streaming RSS with WebSockets

!SLIDE bullets #Good Use Cases

• JSON/REST APIs
• Single page AJAX
• Shell out to command line tools
• Soft realtime apps

###http://nodeguide.com/convincing_the_boss.html

!SLIDE bullets #Not-so-good Use Cases

• CPU bound apps
• CRUD and render
• NoSQL + Node => Buzzword BS

###http://nodeguide.com/convincing_the_boss.html

!SLIDE bullets #Tips

• Make it non-blocking (or non-slow)
• Node ecosystem moves fast
• Use package.json to freeze dependencies
• Side-by-side architecture
• Callbacks all the way down

!SLIDE full-screen