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JavaScript

Make websites interactive: from variables and functions to the DOM, APIs and real projects.

All (12) Beginner (14) Intermediate (10) Advanced (12)

Callbacks and Promises: Waiting Without Freezing the Page

Learn how JavaScript waits for slow tasks without freezing the page. Simulate a food delivery order with setTi...

Advanced 13 min

async and await: Asynchronous Code That Reads Like a Story

Write asynchronous JavaScript that reads top to bottom with async and await. Handle errors with try and catch,...

Advanced 12 min

Fetch API: Getting Live Data from the Internet

Use fetch to show live weather for Indian cities and load posts from a practice API. Handle status codes, load...

Advanced 14 min

The Event Loop: How JavaScript Does One Thing at a Time

See how JavaScript runs one thing at a time with the call stack, Web APIs, the task queue and the microtask qu...

Advanced 13 min

Classes and Objects: Building a Bank Account in JavaScript

Build a bank account with JavaScript classes: constructors, methods, getters and setters, static members and p...

Advanced 13 min

The this Keyword Explained Simply

Understand the JavaScript this keyword with one simple idea: like the word I, it means whoever is calling. Fix...

Advanced 11 min

Regular Expressions: Checking PIN Codes, Mobile Numbers and More

Learn JavaScript regular expressions by validating a KYC form: PIN codes, mobile numbers, PAN and vehicle numb...

Advanced 13 min

Debounce and Throttle: Smarter Search Boxes and Scroll Events

Stop sending a request on every key press. Write your own debounce and throttle functions with setTimeout and ...

Advanced 15 min

Project: Build a Study Planner To-do App

Build a study planner to-do app step by step with plain JavaScript: add, tick, delete and filter tasks, count ...

Advanced 35 min 🔨 Project

Project: Build a Quiz App with Score and Timer

Build a general knowledge quiz app step by step: one question at a time, right and wrong highlights, a score, ...

Advanced 36 min 🔨 Project

Project: Build a Weather App with a Live API

Build a live weather app step by step with fetch and async/await: search a city, show the current weather and ...

Advanced 43 min 🔨 Project

Project: Build a Monthly Expense Tracker

Build a monthly expense tracker step by step: add and delete expenses, total them with reduce, format rupees w...

Advanced 46 min 🔨 Project