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JavaScript & Web Technologies Interview Questions & Answers

Closures, event loop, promises, async/await, DOM, React patterns, and modern ES6+.

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How do event bubbling and delegation help with a dynamic list of buttons?

Many events propagate from the target through ancestor elements. Delegation attaches a listener to a stable ancestor and identifies the relevant descendant, avoiding one listener per dynamically creat...

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What is the output of synchronous code, a resolved promise, and setTimeout with zero delay?

The synchronous statements run first. A promise reaction runs as a microtask after the current task completes, before the next eligible timer task. A zero-delay timer does not mean immediate execution...

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How should fetch code handle HTTP errors and malformed JSON?

fetch usually rejects for network failures, but it resolves for HTTP responses such as 404 or 500. Check response.ok or an expected status before treating the response as successful. JSON parsing can ...

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A live-search page sometimes shows results for an older query. How would you fix it?

Responses can arrive out of order, so the last response received may belong to an earlier query. Track a monotonically increasing request identifier and update the UI only when it matches the current ...

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