Q421. Which HTTP status codes should a REST API return?
Group them by intent and be consistent: - 2xx success: 200 OK, 201 Created (with `Location`), 202 Accepted for async work, 204 No Content after DELETE. - 3xx: 301/308 for...
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Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
Q422. How does Hot Module Replacement work?
Hot Module Replacement updates modules in a running app without a full page reload, preserving application state and often scroll position. When a file changes, the dev s...
Q423. How do you build a custom widget that follows an ARIA authoring pattern?
When no native element supports the interaction, you implement an ARIA design pattern and must replicate all the expected behaviour. A custom combobox, for example, needs...
Q424. How do HTTP caching and CDNs improve performance?
Caching avoids re-downloading assets and is one of the cheapest performance wins. Use content-hashed filenames with a long Cache-Control: public, max-age=31536000, immuta...
Q425. What are arbitrary values and when should you use them?
When a design needs a one-off value that is not in the scale, arbitrary value syntax accepts raw CSS inside square brackets: w-[327px], top-[117px], bg-[#1da1f2], grid-co...
Q426. What lifecycle functions does Svelte provide and when do you use tick?
Svelte components have a small lifecycle API. onMount runs once after the component is first rendered in the browser. It does not run during SSR, so it is the place for D...
Q427. How do you handle metadata and SEO in the App Router?
You export a static metadata object or a generateMetadata async function from a layout or page. It can set title, description, canonical URL, Open Graph, Twitter cards an...
Q428. What is the order of Angular lifecycle hooks?
Angular calls lifecycle hooks in a defined order. The constructor runs first and should only inject dependencies. Then ngOnChanges fires whenever a bound input changes, b...
Q429. Why is the key attribute important in v-for?
The key gives each rendered item a stable identity so Vue can match old and new nodes during patching. Without a key, Vue uses an in-place patch strategy and reuses DOM n...
Q430. How do variables, $?, $@ and $* behave?
Shell variables hold strings and have no strict typing. `$?` is the exit status of the last command, where 0 means success. ```bash greeting="hello" echo "${greeting} wor...