React
React 1) vanilla useEffect state tracking for "side effects" like APIs, event listeners, timers, and cleanup. Talk about the "ignore flag" cleanup pattern inside useEffect to drop stale promises when components unmount or dependencies change. Versus declarative, hook-based data-fetching library (like v4 TanStack Query was React Query v1-3) useMutation auto receives isPending, isError and isSuccess flags. useEffect fires asynchronously after the browser paints the screen to keep the application responsive. useLayoutEffect fires synchronously after DOM mutations but before the browser paints. Using useLayoutEffect blocks the paint loop, causing slight performance penalties, but it prevents visual layout flickers when calculating element dimensions or positions dynamically. 2) export interface OrderRequest { ... fields ... } to keep DTO in synch. (Tools like TypeGen , NSwag , or Typewriter ). 3) Q: Problem with lots of re-renderi...