JavaScript

Modern JavaScript from language fundamentals to async patterns, tuned for revision and interviews.

Frontend

Language

Interview

Chapters

Variables & Scope

How JavaScript stores and looks up values across `var`, `let`, and `const`, and the scoping rules that follow.

Functions & Closures

First-class functions, closures, and the mechanics that make higher-order patterns possible.

Async JavaScript

The event loop, promises, and async/await — the backbone of modern JS.