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JavaScript

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

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

Array Methods: map, filter, reduce, find and sort

Use forEach, map, filter, reduce, find, some, every and sort to work with lists in JavaScript, and build a gro...

Intermediate 12 min

Scope and Hoisting: Where Your Variables Live

Understand global, function and block scope, why let and const replace var, shadowing, hoisting and the tempor...

Intermediate 10 min

Arrow Functions and Closures

Write short arrow functions and understand closures: functions that remember. Build a clinic token machine wit...

Intermediate 10 min

Destructuring, Spread and Rest: Cleaner Code with Objects and Arrays

Unpack arrays and objects with destructuring, copy and merge them with spread, collect values with rest, and h...

Intermediate 12 min

Dates and Time: Countdowns, Ages and Formatting

Create and change dates, find the days between two dates, format dates the Indian way and handle IST and UTC. ...

Intermediate 13 min

JSON: Sending and Saving Data as Text

Learn what JSON is and why servers use it. Turn objects into text with JSON.stringify, read server data with J...

Intermediate 11 min

Error Handling: try, catch and Friendly Error Messages

Catch errors with try, catch and finally, throw your own errors, create a custom PaymentError class and show f...

Intermediate 12 min

Form Validation with JavaScript: Instant, Friendly Feedback

Validate a sign-up form with JavaScript: handle submit, check email, Indian mobile numbers and passwords, show...

Intermediate 18 min

localStorage: Remembering Data in the Browser

Save data in the browser with localStorage so it stays after the page is closed. Store arrays with JSON, read ...

Intermediate 13 min

Modules: Splitting Code into Files with import and export

Split a shop app into small files with JavaScript modules. Learn named and default exports, import with as, sc...

Intermediate 13 min