Should I use useMemo and useCallback everywhere?
No. Wrapping everything in useMemo and useCallback without measuring adds complexity and overhead without benefit, because memoization itself costs something. Use them only when you have a measured performance reason.
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More FAQs in useMemo vs useCallback vs React.memo: When to Use Each
useMemo memoizes a computed value, returning the cached result unless a dependency changed. useCallback memoizes a function, keeping the same reference across renders. Use useMemo for expensive computations and useCallback for functions passed to memoized children.
React.memo is a wrapper for a component that re-renders it only if its props changed by reference. Use it for components that re-render often with the same props, usually combined with useCallback and useMemo for stable prop references.
Wrap a child in React.memo, pass stable values with useMemo, and pass stable callbacks with useCallback. This prevents the child from re-rendering when the parent re-renders but the props have not meaningfully changed.
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