useMemo Hook

The useMemo hook helps optimize performance by memoizing the result of a function—meaning the function won’t re-run unless its dependencies change. This is useful when:

• The computation is expensive (e.g., filtering large lists, complex calculations)

• Recomputing on every render would slow things down

Example:

const filteredItems = useMemo(() => {
  return items.filter(item => item.isVisible);
}, [items]);

If items doesn’t change, React will return the previously cached result, skipping re-execution of the .filter() logic.

When to use it:

• Avoid unnecessary recalculations

• Optimize derived data in render

• Improve child component performance (when memoization is combined with React.memo)

However, avoid overusing useMemo for trivial calculations—it can actually make performance worse if misused. It’s a tool best reserved for truly expensive computations or when reference equality is crucial.

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