React: When to use useMemo and useCallback

Insightful post by Kent C. Dodds on the costs and benefits of React’s useMemo and useCallback.

We hear a lot that you should use React.useCallback to improve performance and that “inline functions can be problematic for performance,” so how could it ever be better to not useCallback?

Just take a step back from React and consider this: Every line of code which is executed comes with a cost.

Measure, and optimize responsibly.

When to useMemo and useCallback →