React Hook useMemo()

What is it?
A hook that lets you memoize or store the result of a calculation between re-renders.

When to use it?
Use it when the component performs "expensive" calculations, such as filtering large datasets, that don't need to run on every single render.

Why use it?
To boost performance. It prevents React from wasting CPU cycles re-calculating the same value if its dependencies haven't changed.

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