Introduction to NodeJS

Zahid Mahir

What is NodeJS?

• Event Driven platform for JavaScript• First released in 2009

• Good for real-time interaction with a website– Chat applications– Location tracking

• Bad for CPU intensive tasks– Predicting the weather

Callbacks

Events

Threads and Scheduling

• Smallest sequence of executable code

• Run multiple threads together via multithreading

• Threads block

• Threads are managed by a Scheduler

Tradition Webserver Example

• Request blog post

• Call to database for post

• Build HTML

• Send response

Event Loop

Taken from: http://misclassblog.com/

How to Code

• Change to only asynchronous programming

Taken from: Matt Perpick, “Writing Asynchronous JavaScript 101”

When to Node

• IO heavy applications

• NOT CPU heavy applications

NPM

• Node Package Manager• Actually stands for “npm is not an acronym”• Install dependencies• Install NodeJS applications• Package and distribute your code

Find Me

zahid@zmhr.mezmhr.me

@zahidmahirgithub.com/zahidmahir

Thank You