Node.js Tutorial for Beginners

1. What is Node

• Great for prototyping and agile development
• Superfast and highly scalable
• Javascript everywhere
• Cleaner and more consistent codebase
• Large ecosystem of open-source libs

2. Node Architecture

it's a runtime environment for executing javascript code.

3. How Node Works

• non-blocking or asynchronous

• blocking or synchronous

Node applications are asynchronous by default.

Node is ideal for I/O-intensive apps.

Do not use Node for CPU-intensive apps.

4. Installing Node

Node.js Download

5. Your First Node Program

function sayHello(name) {
console.log('Hello '+name);
}

sayHello('Karam');

[실행결과] # node app.js

Hello Karam

6. Node Module System

• os(operating system)
• fs(file system)
• events
• http

7. Global Object

// global.변수명

global.setTimeout()
global.clearTimeout();
global.setInterval();
global.clearInterval();

8. Modules

// app.js

console.log(module);

[실행결과] # node app.js

Module {
  id: '.',
  path: 'C:\\workspace\\first-app',
  exports: {},
  parent: null,
  filename: 'C:\\workspace\\first-app\\app.js',
  loaded: false,
  children: [],
  paths: [
    'C:\\workspace\\first-app\\node_modules',
    'C:\\workspace\\node_modules',
    'C:\\node_modules'
  ]
}

9.Creating a Module

// logger.js

var url = 'http://mylogger.io.log';

function log(message){
    // Send an HTTP request
    console.log('hello, log message is ' + message);
}

module.exports.log = log;

10. Loading a Module

//app.js

var logger = require('./logger');

console.log(logger);
logger.log('message');

[실행결과] # node app.js

{ log: [Function: log] }
hello, log message is message

export a single function or an object

// logger.js
var url = 'http://mylogger.io.log';

function log(message){
    // Send an HTTP request
    console.log('hello, log message is ' + message);
}

module.exports = log;

// app.js

const log = require('./logger'); // var가 아닌 const를 사용하는 이유: 변수의 재할당을 막기 위해서

log('message');

[실행결과] # node app.js
hello, log message is message

---

추후 업데이트 예정

11. Module Wrapper Function

12. Path Module

13. OS Module

14. File System Module

15. Events Module

16. Event Arguments

17. Extending EventEmitter

18. HTTP Module

참고사항

Node.js Tutorial for Beginners: Learn Node in 1 Hour