Event build-in module

README.md

@@ -1,16 +1,21 @@
 # nodejs
 ## GET STARTED
-- Hello World
- - https://github.com/lecaoquochung/nodejs/commit/ade8f3963a27527a5725c386e96e005f4bbaebf8
-- Modules (Define & Use)
- - Encapsulate in its own file
+### Hello World
+- https://github.com/lecaoquochung/nodejs/commit/ade8f3963a27527a5725c386e96e005f4bbaebf8
+
+### Modules (Define & Use)
+- Encapsulate in its own file
 ```
 // code.js
 exports.project = 'Nodejs';
 exports.coding = function() {
  console.log('I am coding ' + exports.project);
 }
 ```
--
+- fs build-in module (read & write file)
+ - https://github.com/lecaoquochung/nodejs-example/commit/5dee2e760e010acb15afcaa7ddb3f840b65bba0c
+
+- event build-in module (manage events)
+ -  
 
 ## PROJECT ARCHITECTURE

example/book.js

@@ -0,0 +1,14 @@
+var util = require("util"); // build-in utility module
+var events = require("events");
+var Class = function() { };
+
+util.inherits(Class, events.EventEmitter);
+Class.prototype.ratePoints = 0;
+Class.prototype.rate = function(points) {
+  ratePoints = points;
+  this.emit('rated');
+};
+Class.prototype.getPoints = function() {
+  return ratePoints;
+}
+module.exports = Class;

example/event.js

@@ -0,0 +1,10 @@
+// event build-in
+var events = require('events');
+var eventEmitter = new.events.eventEmitter();
+var somethingHappen = function() {
+  console.log('Something happen!');
+}
+
+eventEmitter
+.on('something-happen', somethingHappen)
+.emit('something-happen');

example/file.js

@@ -0,0 +1,13 @@
+var fs = require('fs'); // build-in read & write file
+
+// write file
+fs.writeFile('data.txt', 'Hello world!', function (err){
+  if(err) {throw err;}
+  console.log('It is saved!');
+});
+
+// read file
+fs.readFile('data.txt', function(err, data){
+  if(err) throw err;
+  console.log(data.toString());
+});

example/server.js

@@ -1,20 +1,21 @@
+// build-in module
 var http = require('http');
-var fs = require('fs');
+
+// module
+// var file = require('./file.js');
 
 http.createServer(function (req,res){
   res.writeHead(200, {'Content-Type': 'text/plain'});
   res.end('Hello World\n')
 }).listen(9000,'127.0.0.1');
 console.log('Server is running at http://127.0.0.1:9000');
 
-// write file
-fs.writeFile('data.txt', 'Hello world!', function (err){
-  if(err) {throw err;}
-  console.log('It is saved!');
-});
+// event with book.js example
+var BookClass = require('./book.js');
+var book = new BookClass();
+book.on('rated', function() {
+  console.log('Rated with ' + book.getPoints());
+})
+book.rate(10);
 
-// read file
-fs.readFile('data.txt', function(err, data){
-  if(err) throw err;
-  console.log(data.toString());
-});
+console.log('///////////');