react-key-prop

Using array indices as React keys causes rendering bugs during item reordering or dynamic insertion because React misidentifies elements, leading to corrupted component state. Stable, data-sourced keys prevent these reconciliation failures and maintain UI correctness.

Generate unique keys for React lists lacking IDs by creating stable identifiers before rendering, ensuring each item receives a persistent key across re-renders. Avoid using array indices as substitutes to prevent anti-patterns and maintain reconciliation performance.

Using index as a key in React lists is acceptable only for static, non-reorderable lists where items are never dynamically inserted or removed. For dynamic data or conditional rendering, stable data-sourced keys are required to avoid anti-patterns and UI glitches.

React list reordering bugs with dynamic data occur when keys are unstable or index-based, causing React's reconciliation algorithm to mismatch components and state. Enforcing stable, unique keys sourced from underlying data resolves these rendering glitches.

Conditional rendering in React affects list key selection by requiring stable, unique keys to track elements appearing and disappearing across renders. Data-sourced keys ensure correct component identification, whereas index-based keys introduce anti-patterns and break UI performance.