Critical Thinking in Node.js

Morgan Cheng

What is Node.JS?

History• 2009, Ryan Dahl published Node.js• Bla Bla Bla

• https://blog.risingstack.com/history-of-node-js/

io.js & node.js

Why choose JavaScript?

JavaScript is clean in I/O

Asynchronous Programming

Scale Out? Scale Up?

Single Thread?IT IS A JOKE

Event Loop

"Everything runs in parallel except your code"

How about add Threading in JavaScript?

Promise vs CPS

CPS• Easy to callback-hell• High Performant

Promise• Seems winning

Rocks for I/O intensive job

Sucks for CPU intensive job

But, Node.js might still fail your Expectation

Watch Out

• Sync API• Loop•Recursion•GC

It Could Freeze You!

Garbage Collection

Real Single Threading

This is Node.js

Happy?

Any Question?