This document provides an introduction and overview of Node.js. It discusses that Node.js is asynchronous and event-driven, uses non-blocking I/O, and is well-suited for data-intensive real-time applications that run across distributed devices. It also provides instructions on getting started with Node.js, including installing it, basic usage like importing modules and writing files, how to create a simple web server, working with event-driven libraries, and popular Node.js projects like Express and Socket.IO.

2. mat@schaffer.me
@matschaffer
http://github.com/
matschaffer
http://mashion.net
didn’t write node.js

4. I’m not Ryan Dahl
but he’ll be at
Philly ETE

5. What is ?

7. ?

10. But why?

11. • Larger developer pool
• Write-once business logic
• Server-side fallbacks
but also....

12. Asynchonous
vs.
Synchronous

13. // Asynchronous
$.get('ajax/test.html',
function(data) {
$('.result').html(data);
alert('Async!');
});

14. // Synchronous
var data = $.get('ajax/test.html');

15. Evented (async)
vs.
Threaded (sync)

19. Getting it (source)
git clone git://github.com/ry/node.git
cd node
./configure --prefix=/usr/local
make
make install || sudo make install

20. Getting it (packaged)
brew install node
port install nodejs

21. Node Basics

22. console.log('hello world');
$ node helloworld.js
hello world

23. var fs = require('fs');
fs.writeFile('hello.txt', 'hello world',
function (err, fd) {
if (err) throw err;
console.log('done.');
});
$ node helloworld.js
done.
$ cat hello.txt
hello world

24. var fs = require('fs');
• require(‘mylib’) ≈ <script src=”mylib.js”>
• require returns the library’s exports

25. module.exports = {
writeFile: function(path, data, callback) {...},
readFile: function(path, callback) {...}
};

26. A web server

27. var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.end("Hello worldn");
}).listen(8000);

28. Working with Evented
Libraries

29. not this...
things.each(function(thing) {
doStuffWith(i);
});

30. this!
things.each(function(thing, next) {
doStuffWith(i, next);
});

31. Get packages with npm
npm install express

32. Testing Options
• Built in assert library
• Jasmine
• Expresso
• Vows

33. Cool Node.js Projects

34. node-inspector

35. Express
var express = require('express'),
app = express.createServer();
app.get('/', function(req, res){
res.send('Hello World');
});
app.listen(3000);

36. Socket.IO
Real time client/server messaging
// socket.io
var socket = io.listen(server);
socket.on('connection', function(client){
// new client is here!
client.on('message', function(){ … })
client.on('disconnect', function(){ … })
});

37. Massively multiplayer
scrabble!!1!1!!

38. App in a browser!!

39. Analytics pr0n!11!!!!1