Experiment07 Updated

+// mymodule.js에 정의된 모듈로 불러서 사용하도록 처리

+// 아래 2개의 함수를 모듈로 정의하는 것이 필요함
+function add(a,b) {
+	return a+b;
+}
+function sub(a,b) {
+	return a-b;
+}

+// Consumer 코드는 변경할 필요 없음
+var Producer = require('./producer');  
+var producer = new Producer();
+
+producer.on('add', function(t) {  
+	  console.log('add:', t);
+});
+
+producer.start();

+var inherits = require('util').inherits;  
+var EventEmitter = require('events').EventEmitter;
+
+
+var Producer = function () {  
+	  if (! (this instanceof Producer)) return new Producer();
+
+	  EventEmitter.call(this);
+}
+
+// inherits를 활용, Producer construct가 EventEmitter Construct를 상속받음
+inherits(Producer, EventEmitter);
+
+// producer의 start 함수를 재정의
+Producer.prototype.start = function () {
+
+	// Random 스트링을 생성하여 이것을 Event에 실어서 보내야 하는 코드 작성 
+
+
+}
+
+
+module.exports = Producer;

-var a = 33;
-var b = 10;
-var c = "Test";
-console.log("a + b = ");
-result = a + b;
-console.log(result);
-
-console.log("a - b = ");
-result = a - b;
-console.log(result);
-console.log("a / b = ");
-result = a / b;
-console.log(result);
-console.log("a % b = ");
-result = a % b;
-console.log(result);
-console.log("a + b + c = ");
-result = a + b + c;
-console.log(result);
-a = a++;
-console.log("a++ = ");
-result = a++;
-console.log(result);
-b = b--;
-console.log("b-- = ");
-result = b--;
-console.log(result);

-var a = 33;
-var b = 10;
-console.log("Value of a => (a = b) => ");
-result = (a = b);
-console.log(result);
-console.log("Value of a => (a += b) => ");
-result = (a += b);
-console.log(result);
-console.log("Value of a => (a -= b) => ");
-result = (a -= b);
-console.log(result);
-console.log("Value of a => (a *= b) => ");
-result = (a *= b);
-console.log(result);
-console.log("Value of a => (a /= b) => ");
-result = (a /= b);
-console.log(result);
-console.log("Value of a => (a %= b) => ");
-result = (a %= b);
-console.log(result);

-var a = 2; // Bit presentation 10
-var b = 3; // Bit presentation 11
-console.log("(a & b) => ");
-result = (a & b);
-console.log(result);
-
-console.log("(a | b) => ");
-result = (a | b);
-console.log(result);
-
-console.log("(a ^ b) => ");
-result = (a ^ b);
-console.log(result);
-
-console.log("(~b) => ");
-result = (~b);
-console.log(result);
-
-console.log("(a << b) => ");
-result = (a << b);
-console.log(result);
-
-console.log("(a >> b) => ");
-result = (a >> b);
-console.log(result);

-var a = 10;
-var b = 20;
-console.log("(a == b) => ");
-result = (a == b);
-console.log(result);
-
-console.log("(a < b) => ");
-result = (a < b);
-console.log(result);
-console.log("(a > b) => ");
-result = (a > b);
-console.log(result);
-console.log("(a != b) => ");
-result = (a != b);
-console.log(result);
-console.log("(a >= b) => ");
-result = (a >= b);
-console.log(result);
-console.log("(a <= b) => ");
-result = (a <= b);
-console.log(result);

-var a = 10;
-var b = 20;
-var linebreak = "<br />";
-console.log ("((a > b) ? 100 : 200) => ");
-result = (a > b) ? 100 : 200;
-console.log(result);
-console.log ("((a < b) ? 100 : 200) => ");
-
-result = (a < b) ? 100 : 200;
-console.log(result);

+var events = require('events');
+var eventEmitter = new events.EventEmitter();
+var connectHandler = function connected() {
+     console.log('connection successful.');
+     eventEmitter.emit('data_received');
+}
+
+eventEmitter.on('connection', connectHandler);
+
+eventEmitter.on('data_received', function(){
+    console.log('data received successfully.');
+});
+
+eventEmitter.emit('connection');
+console.log("Program Ended.");

+var events = require('events');
+var eventEmitter = new events.EventEmitter();
+var listner1 = function listner1() {
+console.log('listner1 executed.');
+}
+var listner2 = function listner2() {
+console.log('listner2 executed.');
+}
+
+eventEmitter.addListener('connection', listner1);
+eventEmitter.on('connection', listner2);
+var eventListeners = require('events').EventEmitter.listenerCount(eventEmitter,'connection');
+console.log(eventListeners + " Listner(s) listening to connection event");
+
+eventEmitter.emit('connection');
+eventEmitter.removeListener('connection', listner1);
+console.log("Listner1 will not listen now.");
+
+eventEmitter.emit('connection');
+eventListeners = require('events').EventEmitter.listenerCount(eventEmitter,'connection');
+console.log(eventListeners + " Listner(s) listening to connection event");
+console.log("Program Ended.");

-var numbers = new Array(1,2,2,3,4)
-for (var num in numbers) {
-  // key and Value
-  console.log(num + "  =  " + numbers[num]);;
-}
-console.log ("Exiting from the loop!");

-var age = 20;
-if( age > 18 ) {
-  console.log("Qualifies for driving");
-}
-
-var age = 15;
-if( age > 18 ) {
-  console.log("Qualifies for driving");
-} else {
-  console.log("Does not qualify for driving");
-}
-
-
-var book = "maths";
-if( book == "history" ) {
-  console.log("History Book");
-} else if( book == "maths" ) {
-  console.log("Maths Book");
-} else if( book == "economics" ) {
-  console.log("Economics Book");
-} else {
-  console.log("Unknown Book");
-}

-var a = true;
-var b = false;
-console.log("(a && b) => ");
-result = (a && b);
-console.log(result);
-console.log("(a || b) => ");
-result = (a || b);
-console.log(result);
-console.log("!(a && b) => ");
-result = (!(a && b));
-console.log(result);

+
+var dt = require('./mymodule');
+
+console.log(dt.myDateTime());

+exports.myDateTime = function () {
+    return Date();
+};

-var grade='A';
-console.log("Entering switch block");
-
-switch (grade)
-{
-  case 'A':
-  console.log("Good job");
-  break;
-
-  case 'B':
-  console.log("Pretty good");
-  break;
-
-  case 'C':
-  console.log("Passed");
-  break;
-
-  case 'D':
-  console.log("Not so good");
-  break;
-
-  case 'F': console.log("Failed");
-  break;
-
-  default:
-  console.log("Unknown grade")
-}
-
-console.log("Exiting switch block");
-
-
-
-switch (grade)
-{
-  case 'A':
-  console.log("Good job");
-
-  case 'B':
-  console.log("Pretty good");
-
-  case 'C':
-  console.log("Passed");
-
-  case 'D':
-  console.log("Not so good");
-
-  case 'F':
-  console.log("Failed");
-
-  default:
-  console.log("Unknown grade");
-
-}
-
-console.log("Exiting switch block");

-var a = 10;
-var b = "String";
-result = (typeof b == "string" ? "B is String" : "B is Numeric");
-console.log("Result => ");
-console.log(result);
-result = (typeof a == "string" ? "A is String" : "A is Numeric");
-console.log("Result => ");
-console.log(result);

-var name = "Ali";
-var money;
-money = 2000;
-
-console.log("my name is " + name);
-console.log("my money is " + money);
-
-var myVar = "global"; // Declare a global variable
-function checkscope( ) {
-  var myVar = "local";
-  // Declare a local variable
-  console.log("print myVar " + myVar);
-}
-
-console.log("print myVar " + myVar);
-checkscope();

-var count = 0;
-console.log("Starting Loop ");
-
-while (count < 10) {
-  console.log("Current Count : " + count);
-  count++;
-}
-console.log("Loop stopped!");
-
-
-var count = 0;
-console.log("Starting Loop");
-do {
-  console.log("Current Count : " + count);
-  count++;
-} while (count < 5);
-console.log ("Loop stopped!");

-function addPrice(amount) {
-    this.price = amount;
-}
-function book(title, author) {
-    this.title = title;
-    this.author = author;
-    this.addPrice = addPrice;
-}
-
-var bookList = new Array(new book("Perl1", "Mohtashim"),new book("Smith", "Mohtashim"),new book("Carl", "Mohtashim"),new book("Perl2", "Mohtashim"));
-
-console.log(bookList);
-console.log("After Sorting");
-bookList.sort(sortBook);
-// sortBook 이라는 comparing function을 완성하시오.
-// sortBook(a, b) { if (a > b) return 1; else if (a < b) return -1; else return 0;
-// 1 순위 : title
-// 2 순위 : author
-console.log(bookList);

-function slice(str, start, end) {
-
-}
-var str = "Apples are round, and apples are juicy.";
-var sliced = str.slice(1, 3);
-
-// String.slice method와 동일하게 동작하는 slice function을 구현하시오.
-// 아래의 console.log 2개의 출력이 동일해야 함 
-
-console.log( sliced );
-console.log( slice(str, 1, 3));

-function reverse (input) {
-
-}
-var arr = [0, 1, 2, 3];
-
-// Array.reverse Method와 동일하게 동작하는 reverse function을 구현하시오.
-// 아래의 console.log 2개의 출력이 동일해야 함
-
-console.log ("Reversed array is : " + arr.reverse() );
-arr.reverse();
-console.log ("Reversed array is : " + reverse(arr));

-var test = new Array(1,2,3,4,5,6);
-
-for (var aa in test) {
-  console.log(aa);
-}