JavaScript Essentials
BeginnerThe language of the web. From DOM manipulation to modern ES6+, async/await, and Node.js fundamentals.
Tracks
Master JavaScript variables, data types, operators, control flow, and function fundamentals.
Manipulate the DOM, handle events, use localStorage, and interact with browser APIs.
Write modern JS with arrow functions, destructuring, spread/rest, modules, and the latest ES features.
Master the event loop, callbacks, Promises, async/await, and the Fetch API.
Understand closures, `this` binding, the prototype chain, ES6 classes, and OOP patterns in JavaScript.
Certification Exam
Certification Exam
JavaScript Essentials
All tracks · No time pressure to start
Certification Exam
JavaScript Essentials
250 Questions
All difficulty levels
60 Minutes
Auto-submits when time expires
70% to Pass
Earn your certification badge
No Going Back
Once you answer, you move forward
Tips
See allArrow Functions & `this`
Why arrow functions don't have their own `this`
Destructuring Assignment
Unpack arrays and objects in one clean line
Spread vs Rest Operators
Same syntax, opposite purposes
Optional Chaining & Nullish Coalescing
Safely access nested properties without crashes
