Basic guide of nodejs, from its feature, module system, npm, cluster to expressjs.

1. NODEJS GUIDENODEJS GUIDE
prepare by Andy Chen

2. AGENDAAGENDA
NodeJS Feature
NodeJS Module
Cluster
NPM
ExpressJS

3. NODEJS FEATURENODEJS FEATURE
A JavaScript runtime
Built on Chrome's V8 JS engine
Single thread, event-driven, non-blocking I/O
Biggest package ecosystem, NPM

4. NODEJS MODULENODEJS MODULE
Base on CommonJS module system

5. MODULE REQUIRE TYPEMODULE REQUIRE TYPE
Directly module require, e.g. require('express')
It will rst check built-in module, then node_modules and
../node_modules and ../../node_modules until root folder.
Path speci c require, e.g. require('./my-module')
Using when not npm nodule or built-in module

6. MODULE REQUIRE ORDERMODULE REQUIRE ORDER
1. Cache (Module will be stored in cache when rst time
require)
2. Built-in module
3. Current folder
4. Parent folder until root

7. MODULE REQUIRE SUFFIXMODULE REQUIRE SUFFIX
require() will automatically add .js, .json, .node
suf x, it is suggested to add .json , .node suf x so it could
be found faster.

8. CLUSTERCLUSTER
Multi-CPU => Multi-process to optimize performance
Will not crash when one process crashed
Master-child process communicate by IPC
cluster.js demo

9. EVENT LOOPEVENT LOOP
The concept of Javascript excution order - Event loop

10. EXPRESSJSEXPRESSJS
Flow control by Middleware
rstExpress.js demo
http://expressjs.com/zh-tw/

11. REFERENCEREFERENCE
Cluster
深入淺出Nodejs
Event loop

12. Q & AQ & A

13. THANK YOUTHANK YOU