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Top 50 react Interview Questions

The most frequently asked react questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
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1
CodingStart here. 29 questions · ~289 min
Custom Hook for Debounce/ThrottleMedium
Practice

Simulate a debounce operator that emits only the latest Tech(x search event after a quiet interval.

reactdebouncingTech(x)Bask Health
Type-Safe Dynamic List RendererMedium
Practice
Recently asked

Compute a render diff for dynamic components using hashing and state comparison to update only changed items.

ui componentreacttypescriptPerplexity AI
Debounced Search with Cached ResultsHard
Practice

Simulate a debounced search stream and return emitted substring matches using caching to avoid repeated work.

reacttypescriptFrameworksSpeechify
Increment Without GlobalsEasy
Practice

Create an independent stateful increment function using a closure, without global variables or shared state.

reactTimes Internet
React Performance Re-Render FixesMedium
Recently asked

Tests React performance tuning techniques focused on minimizing wasted renders.

reactperformanceoptimizationPublicis GroupeSprinklrPublicis Sapient
Optimize a Simple React AppMedium

Assesses React fundamentals and practical performance optimization for a web feature.

reactArray ManipulationScribe
Find the Right React ComponentHard
Recently asked

Evaluates your ability to navigate large React component hierarchies and make targeted updates.

reactAshby
Multi-Select Dropdown ComponentMedium

Tests your ability to implement complex UI interactions and component state.

reactCoinbase
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2
System Design11 questions · ~110 min
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3
Software Architecture5 questions · ~50 min
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4
More topics5 questions · ~50 min
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