← Back to JavaScript overview

Hand-written tutorials, ordered as a recommended learning path.

1. 21 Proxy & Reflect Guide Master JavaScript Proxy and Reflect API for metaprogramming with practical examples including validation, observable objects, and access control patterns. 7 min read →
2. 22 Streams API Guide Master the JavaScript Streams API to process large files, network responses, and data pipelines incrementally without loading everything into memory. 7 min read →
3. 23 Web Workers Guide Learn how to use JavaScript Web Workers to run CPU-intensive code off the main thread, keeping your UI responsive with practical examples and patterns. 7 min read →
4. 24 Decorator Pattern Learn the Decorator pattern in JavaScript -- wrap functions and classes to add logging, caching, validation, and retry logic without modifying original code. 6 min read →
5. 25 Error Handling Patterns Master JavaScript error handling with custom error classes, async error patterns, Result types, error boundaries, and strategies for robust production code. 6 min read →
6. 26 FinalizationRegistry & WeakRef Learn how to use WeakRef and FinalizationRegistry for custom cleanup callbacks, weak caching, and observing garbage collection in JavaScript. 6 min read →
7. 27 Module Federation Understand Module Federation for micro-frontends -- share dependencies at runtime, load remote modules dynamically, and compose independent apps into one. 6 min read →
8. 28 Observable Pattern Implement the Observable pattern in JavaScript to build reactive event streams, compose data pipelines, and manage async flows without third-party libraries. 6 min read →
9. 29 Performance API Use the Performance API to measure load times, mark custom timings, observe long tasks, and profile real-user performance in JavaScript applications. 6 min read →
10. 30 Promise Combinators Master all four JavaScript Promise combinators -- Promise.all, allSettled, race, and any -- with practical patterns for concurrency, timeouts, and resilience. 7 min read →
11. 31 SharedArrayBuffer & Atomics Learn how to use SharedArrayBuffer and Atomics to share memory between threads, coordinate Web Workers, and build lock-free data structures in JavaScript. 6 min read →
12. 32 Streams API Process data incrementally with the JavaScript Streams API -- ReadableStream, WritableStream, TransformStream, and practical patterns for large data handling. 6 min read →
13. 33 Symbols & Well-Known Symbols Master JavaScript Symbols for unique property keys, explore well-known symbols like Symbol.iterator and Symbol.toPrimitive, and learn metaprogramming patterns. 6 min read →
14. 34 AbortController Patterns Master AbortController in JavaScript -- cancel fetch requests, debounce events, set timeouts, and build cancellable async workflows. 6 min read →
15. 35 Event Loop Visualized Visualize how the JavaScript event loop works -- understand the call stack, microtask queue, macrotask queue, and execution order. 6 min read →
16. 36 Generators & Iterators Master JavaScript generators and iterators -- learn function*, yield, Symbol.iterator, and how to build custom iterable objects. 6 min read →
17. 37 Intl API Formatting Master the JavaScript Intl API for locale-aware formatting of numbers, currencies, dates, relative time, and list conjunctions. 6 min read →
18. 38 Pattern Matching Explore pattern matching in JavaScript today with switch(true), and preview the TC39 pattern matching proposal for cleaner conditional logic. 7 min read →
19. 39 Private Class Fields Learn JavaScript private class fields with #, static blocks, private methods, and how they compare to closures and WeakMap patterns. 6 min read →
20. 40 Proxy & Reflect Learn how to use JavaScript Proxy and Reflect to intercept operations, build validators, create observable objects, and write metaprogramming patterns. 6 min read →