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How does React’s diffing algorithm optimize keyed vs non-keyed lists internally?

Expert React

Answer

Keyed diffing builds a keyed map to detect moves, deletions, and insertions. Non-keyed diffing assumes positional alignment, which is faster but incorrect for reordering.
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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

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