If you are new to JavaScript, learn the basics first (variables, functions, promises). Node.js uses JavaScript, but runs it on the server.
- 1Install Node.js LTS
- 2Create a project with
package.json - 3Build a simple API and deploy
What is JavaScript?
JavaScript makes pages interactive through logic and events.
JS Syntax
Statements, expressions, and blocks form JavaScript syntax.
JavaScript Variables
Variables hold runtime values using const/let/var.
JavaScript Data Types
Type awareness prevents bugs and invalid operations.
JavaScript Operators
Operators build business logic and conditions.
JavaScript Functions
Functions encapsulate reusable logic blocks.
JavaScript Arrays
Arrays are key for list processing in apps.
JavaScript Comments
Comments explain intent for maintainers.
JavaScript Objects
Objects hold structured app data.
DOM Basics
DOM APIs connect state and interface.
JavaScript Events
Events capture user interactions and trigger logic.
Conditions & Loops
Conditionals and loops control logic flow.
ES6 Features
Modern syntax improves readability and consistency.
Async JavaScript
Async/await handles delayed operations cleanly.
Closures & Scope
Closures keep access to outer scope after execution.
Promises & Fetch
Fetch retrieves API data; promises handle async lifecycle.
JavaScript Best Practices
Modular, testable code reduces bugs and improves maintainability.
this & Binding
In JavaScript, this depends on how a function is called. Arrow functions do not create their own this.
this set to the element.Classes & OOP
Classes organize code into reusable blueprints. They are commonly used for UI components, data models, and app structure.
extends and super() for inheritance. Keep classes small.Array Methods
Instead of manual loops, you can use map, filter, and reduce for clean, readable code.
JSON & Storage
localStorage stores strings. Convert objects with JSON.stringify and back with JSON.parse.
Error Handling
Use try/catch to catch errors and keep the UI working. Log details to the console for debugging.
console.error.Async/Await & Fetch
async/await makes promise-based code easier to read. This demo uses a data: URL so it works without internet.
try/catch with async functions to handle errors cleanly.Timers & Intervals
Use setTimeout for one-time delays and setInterval for repeated tasks. Always clear intervals to avoid leaks.
if(t) return line prevents starting multiple intervals.Mini Project: To-Do List
Build a tiny to-do list with DOM + events + storage. Add tasks, delete tasks, and keep them saved in the browser.
localStorage.