Child re-renders with unchanged props: function identity and useCallback fix
This tests reference equality and React memoization. A strong answer says inline functions recreate on every parent render, breaking React.memo, and uses useCallback with a correct dependency array. A red flag is ignoring identity or omitting dependencies.
This tests JavaScript reference equality and how React compares props. A strong answer explains that every parent render creates a new inline function reference, which appears as a changed prop to React.memo or PureComponent, triggering an unnecessary child re-render. The fix is wrapping the function with useCallback and providing a correct dependency array so React reuses the same function instance across renders.
Read the original → react.dev
- #react
- #usecallback
- #memoization
- #performance
- #referential-equality
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