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PrepAI — Interview Session
Frontend Interview — Medium
Question 3 of 5  •  12 min elapsed
Explain the difference between useEffect and useLayoutEffect in React. When would you use each?
useEffect runs asynchronously after the DOM has been painted, while useLayoutEffect runs synchronously before the paint. I'd use useLayoutEffect when I need to measure DOM elements...
82
Score
Accuracy
Depth
Clarity
Frontend DevelopmentBackend DevelopmentFull StackData Structures & AlgorithmsSystem DesignDevOpsFrontend DevelopmentBackend DevelopmentFull StackData Structures & AlgorithmsSystem DesignDevOps

Features

Everything you need to prepare

From AI-generated questions to detailed feedback — PrepAI covers the full interview prep cycle.

AI Mock Interviews

Real questions generated by Groq AI tailored to your role and difficulty level.

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Weak Area Detection

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Resume Analyzer

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Question Bank

500+ curated questions organized by role, topic, and difficulty for self-practice.

Progress Tracking

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Process

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01

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02

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03

Answer questions

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04

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Roles

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Questions curated by industry experts for each specific role and stack.

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DSA
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System Design
80+ questions

Testimonials

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Backend at CRED
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Product Manager @ FinTech
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Marketing Director @ GlobalMedia
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Data Analyst @ RetailGiant

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