Free interactive · JavaScript
Start with the basics of variables, data types and control flow, then master the DOM, modern ES6+ features, asynchronous programming, testing, performance, security and progressive‑enhancement techniques. By the end you’ll be able to build…
What you'll learn
Curriculum preview
What is JavaScript?
JS runs in the browser and on many servers (Node.js).
Variables – var, let & const
`let` and `const` are block‑scoped and prevent many bugs caused by `var`.
Data Types & Type‑Coercion
JavaScript is loosely typed – values are converted automatically in many operations.
Operators & Expressions
Prefer `===`/`!==` over `==`/`!=` to avoid unwanted coercion.
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