Master JavaScript from basics to advanced
Web Workers move heavy computation off the main thread. Learn advanced patterns with transferables, SharedArrayBuffer, OffscreenCanvas, and worker pools for maximum performance.
An Abstract Syntax Tree is the structured representation of your JavaScript code after parsing. Learn what ASTs are, how tools like Babel and ESLint use them, and how to explore ASTs yourself.
Self-modifying code changes its own behavior at runtime. Learn how JavaScript enables this through eval, the Function constructor, Proxy, and monkey-patching, and when to avoid it.
Generators are functions that can pause and resume execution, yielding values one at a time. Learn how function*, yield, and next() work, and when generators outperform regular functions.
The Proxy object lets you intercept and redefine fundamental operations on any target object. Learn every trap, revocation, and real-world use case for JavaScript proxies.
The proxy pattern places a substitute object between the caller and the real target. Learn virtual proxies, caching proxies, lazy initialization, and access control patterns in JavaScript.
Data binding keeps your UI in sync with your data automatically. Learn how to build a reactive data binding system using JavaScript Proxy that updates the DOM whenever state changes.
Regular expressions match patterns in text. Learn JavaScript regex syntax, the test and exec methods, flags, character classes, quantifiers, and practical patterns for validation and search.
Capture groups, lookahead, lookbehind, named groups, and the replace method turn regex from a search tool into a powerful text transformation engine. Learn every advanced regex feature in JavaScript.
Symbol is a unique, immutable primitive type in JavaScript. Learn what symbols are, why they exist, and how to use them for private property keys, well-known symbols, and metaprogramming.
An iterator is any object that defines a next() method returning {value, done}. Learn how JavaScript iteration works under the hood, and how to build custom iterators for any data structure.
The iterable protocol is the contract that lets any object work with for...of, spread, and destructuring. Learn how Symbol.iterator makes your data structures work with JavaScript's iteration syntax.
