What is the useMemo hook in React?

What is the useMemo hook in React?

The useMemo hook is a React hook that memoizes the result of a computation, optimizing performance by preventing unnecessary recalculations.

When should I use useMemo?

You should use useMemo when you have expensive calculations that you want to avoid recalculating on every render, especially if the dependencies haven't changed.

Can you give me an example of useMemo in action?

Sure! Here's a simple example:

const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);

This will only recompute the value when 'a' or 'b' changes.

Are there any downsides to using useMemo?

Yes, overusing useMemo can lead to more complexity and may not always yield performance benefits. It's best used when necessary.