Top 50 react Interview Questions
The most frequently asked react questions across all roles and companies, ranked by real interview frequency. Updated daily.
Process Like button actions as a state machine while keeping its liked status and count consistent.
Amazon Kuiper Commercial Services
SupermicroConvert flat UI component definitions into a nested hierarchy using parent references and a tree data structure.
Persistent SystemsBBESTSECRET Group
Capital Technology GroupImplement a normalized state reducer that handles shared entities and page-specific UI state across multiple application pages.
Compass
Digitas México33PillarSimulate a debounce operator that emits only the latest Tech(x search event after a quiet interval.
Tech(x)
Bask HealthImplement Wordle feedback using exact-match marking and frequency counts for repeated letters.
RampTrack toggled dropdown selections with a set and return selected options in their original order.
CoinbaseImplement a mutable canvas with paint, undo, and redo operations using history management.
Return the correct data-passing pattern for each component relationship.
DeloitteUse a recursive CTE to determine whether each stored string has balanced parentheses, including empty and NULL inputs.
StripeFind each array's second-largest distinct value and determine whether input numbers are powers of two in PostgreSQL.
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