Answer
React 17 batched updates only inside React events. React 18 batches updates automatically in async operations like promises and timeouts.
Quick Answer
React 17 only batched state updates inside event handlers — updates in setTimeout or promises caused separate re-renders. React 18 introduced automatic batching: all state updates (in any context — timeouts, promises, native events) are batched together into one re-render. Fewer re-renders, better performance by default.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ