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React and TypeScript interview prep

The frontend questions Indian interviewers keep asking, from JavaScript and the event loop to hooks, rendering, TypeScript and machine coding. Say each answer aloud before you open it.

Ten topics, ordered the way most rounds unfold. Short on time? Topic 10 has the priority table and the 20 must-not-get-wrong list.

How to use this page

Fresher · 0–2 yrs, SDE-1 Mid · 2–5 yrs, SDE-2 Senior · 5+ yrs

Every answer has the same parts: what to say, the follow-up you'll likely get, and the trap that catches most candidates. Filter to your level, but skim one level above it.

Code cards marked "predict" show the snippet first. Say the output and why before you reveal it. Examples target React 19 and TypeScript 5.x. Each answer says whether its basis is a documentation page we saw or a widely reported pattern.