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');

［実行結果］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);

［実行結果］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');

［実行結果］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');

［実行結果］node app.js
hello, log message is message
更新

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

注意事項

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