Initial

events/listing_1.js

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+var x = 1;
+var foo = function(callbackfn) {
+	return callbackfn(x * 2);
+};
+
+foo(function(x) {
+	console.log(x);
+});

events/listing_2.js

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+var events = require('events'),
+	util = require('util');
+
+var Foo = function(initial_no) { this.count = initial_no; };
+
+Foo.prototype = new events.EventEmitter;
+
+Foo.prototype.increment = function() {
+	var self = this;
+	setInterval(function() {
+		if(self.count % 2 === 0) self.emit('even');
+		self.count++;
+	}, 300);
+};
+
+var lol = new Foo(1);
+
+lol.on('even', function() { 
+	util.puts('Number is even! :: ' + this.count);
+}).increment();

events/listing_3.js

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+var util = require('util'),
+	http = require('http'),
+	events = require('events');
+
+var TwitterStream = function(opts) {
+	this.username = opts.username;
+	this.password = opts.password;
+	this.track = opts.track;
+	this.data = '';
+};
+
+TwitterStream.prototype = new events.EventEmitter;
+module.exports = TwitterStream;

events/listing_4.js

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+TwitterStream.prototype.getTweets = function() {
+	var opts = {
+			host: 'stream.twitter.com',
+			port: 80,
+			path: '/1/statuses/filter.json?track=' + this.track,
+			method: 'POST',
+			headers: {
+				'Connection': 'keep-alive',
+				'Accept': '*/*',
+				'User-Agent': 'Example Twitter Streaming Client',
+				'Authorization': 'Basic ' + new Buffer(this.username + ':' + this.password).toString('base64'),
+			},
+		},
+		self = this;
+	
+	this.connection = http.request(opts, function(response) {
+		response.setEncoding('utf8');
+		response.on('data', function(chunk) {
+			self.data += chunk.toString('utf8');
+
+			var index, json;
+
+			while((index = self.data.indexOf('\r\n')) > -1) {
+				json = self.data.slice(0, index);
+				self.data = self.data.slice(index + 2);
+				if(json.length > 0) {
+					try {
+						self.emit('tweet', JSON.parse(json));
+					} catch(e) {
+						self.emit('error', e);
+					}
+				}
+			}
+		});
+	});
+
+	this.connection.write('?track=' + this.track);
+	this.connection.end();
+};

events/listing_5.js

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+var TwitterStream = require('./twitterstream'),
+	util = require('util');
+
+var twitter = new TwitterStream({
+	username: 'username',
+	password: 'password',
+	track: 'JavaScript',
+});
+
+twitter.on('tweet', function(tweet) {
+	util.puts(util.inspect(tweet));
+})
+
+twitter.on('error', function(e) { 
+	util.puts(e); 
+})
+
+twitter.getTweets();

events/twitterstream.js

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+var util = require('util'),
+	http = require('http'),
+	events = require('events');
+
+var TwitterStream = function(opts) {
+	this.username = opts.username;
+	this.password = opts.password;
+	this.track = opts.track;
+	this.data = '';
+};
+
+TwitterStream.prototype = new events.EventEmitter;
+
+TwitterStream.prototype.getTweets = function() {
+	var opts = {
+			host: 'stream.twitter.com',
+			port: 80,
+			path: '/1/statuses/filter.json?track=' + this.track,
+			method: 'POST',
+			headers: {
+				'Connection': 'keep-alive',
+				'Accept': '*/*',
+				'User-Agent': 'Example Twitter Streaming Client',
+				'Authorization': 'Basic ' + new Buffer(this.username + ':' + this.password).toString('base64'),
+			},
+		},
+		self = this;
+	
+	this.connection = http.request(opts, function(response) {
+		response.setEncoding('utf8');
+		response.on('data', function(chunk) {
+			self.data += chunk.toString('utf8');
+
+			var index, json;
+
+			while((index = self.data.indexOf('\r\n')) > -1) {
+				json = self.data.slice(0, index);
+				self.data = self.data.slice(index + 2);
+				if(json.length > 0) {
+					try {
+						self.emit('tweet', JSON.parse(json));
+					} catch(e) {
+						self.emit('error', e);
+					}
+				}
+			}
+		});
+	});
+
+	this.connection.write('?track=' + this.track);
+	this.connection.end();
+};
+
+module.exports = TwitterStream;