Answer
Impure reducers cause unpredictable state and break React’s deterministic rendering model.
Quick Answer
Pure reducers make state transitions predictable and testable. React may call the reducer multiple times in Strict Mode or concurrent rendering to verify it's pure. An impure reducer (one with side effects or non-deterministic output) would produce different states on each call — causing unpredictable behavior.
S
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.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ