3 pages from the guide: the cover, the contents (100 questions in 9 sections) and one complete question with its answer, code and interview tips.
React interviews mix fundamentals (rendering, state, keys, effects) with questions on what changed in React 19 and on debugging broken components. This guide answers 100 questions in nine sections: core concepts, two sections on hooks, the React 19 features, state and data, performance, component patterns, testing with TypeScript and accessibility, and ten components you have to diagnose. Each question has a short answer you can say first, a fuller explanation, a TypeScript example, the common wrong answer and a likely follow-up.
100 questions in 9 sections, 97 code examples in a 134-page PDF (2026 edition).
Angular e-books, Node.js and JavaScript video courses, 100+ front-end e-books and 3000+ interview Q&A.
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Answer each question out loud before reading the quick answer, then read the explanation and the trap. Spend extra time on the hooks, React 19 and gotchas sections, and try to spot the bug in each gotcha before reading the fix.
const [state, formAction, isPending] = useActionState(action, initialState) wraps an Action. action receives the previous state and the form data and returns the next state (it may be async), so the result of the last run, usually validation errors or a success flag, becomes state. Pass formAction to <form action>. It replaces useFormState from react-dom, which was renamed.
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It covers this topic in depth. It is one topic from the TechTribers Java Interview Series, which has all 23 parts (1,200+ questions) in one bundle.
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75 Next.js App Router interview questions for Next.js 16: routing, Server and Client Components, caching and revalidation, Server Actions, rendering, proxy and auth, SEO and deployment.
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100 JavaScript "what is the output?" interview questions with answers: coercion, hoisting, closures, this, prototypes, the event loop, promises and async/await. Outputs run on Node.js.
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