Under the Hood
No fluff — just patterns, performance, and hard-won lessons from shipping production projects.
TypeScript enums carry runtime cost and type holes most people never notice. A const object with as const is safer, lighter, and friendlier at boundaries.
You render an input, set its value, and suddenly can't type. The fix is one question: who owns the value — React or the DOM? Here's how to tell which you need.
Showing a counter's previous value in React looks trivial. Here's why useState is the wrong tool, and how useRef with useEffect does it cleanly.