JavaScript

6 topics cover JavaScript across the Foundation 100.

Module 2 · Node.js & Express Foundations

Node.js Runtime

How Node.js runs JavaScript outside the browser on the V8 engine, using a single-threaded event loop and non-blocking I/O to handle many requests at once.

intermediate2 min read

Node.js Modules (ES Modules & CommonJS)

How Node splits code into reusable modules, and the difference between the older CommonJS (require) and the standard ES Modules (import) systems.

Module 5 · React Foundations

beginner2 min read

React Components

The building block of a React app: a function that returns markup describing a piece of the UI, which you compose together to build whole screens.

beginner2 min read

JSX

The syntax that lets you write markup directly inside JavaScript, embedding dynamic values with curly braces so UI and logic live together.

beginner2 min read

State

A component's memory: data that changes over time and, when updated through the setter, causes React to re-render the component with the new value.

beginner2 min read

Events

How React components respond to user interaction by attaching handler functions to elements, typically updating state in response.

Projects using JavaScript

Practice JavaScript on real Padlor projects — coming soon.