The answer
Closures, the event loop, polyfills (map, filter, reduce, bind), debounce (Flipkart), throttle (Walmart), currying sum(1)(2)(3) (Amazon), call/apply/bind, prototypes, event bubbling (Oyo), event delegation, async/defer (Ola), and CORS.
Frontend Interview Questions Asked by Top Companies
What JavaScript questions are asked in frontend interviews at top companies?
More FAQs in Frontend Interview Questions Asked by Top Companies
OTP input, progress bar, autocomplete search bar, pagination, tab form, file explorer, food ordering app, image carousel, accordion, and modal. Practice building each in 90 minutes.
Hooks (useState, useEffect, useMemo, useCallback, useRef), reconciliation, virtual DOM, keys, custom hooks (useDebounce, useFetch), context vs Redux, and performance optimization (memo, lazy loading, code splitting).
Design Instagram's feed, Netflix's video player, Twitter's feed, WhatsApp's chat, an autocomplete search system, a multi-step form wizard, or a notification system. Discuss rendering, state management, APIs, and performance.
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