Mastering Memoization with useMemo in React

performance optimization

In React, you can utilize useMemo for memoization, a technique for optimizing speed by storing costly function call results and reusing them when identical inputs occur.

import React, { useMemo } from 'react'; function MyComponent({ values }) { const sortedValues = useMemo(() => { return values.sort((a, b) => a - b); }, [values]); return <div>{sortedValues}</div> }

In this component, useMemo is used to cache the sorted values array. The second argument to useMemo is an array of dependencies. The memoized value is only recalculated when one of these dependencies changes.

By using useMemo, we ensure the expensive sort operation is not performed unless values changes. This can greatly improve performance in large applications where unnecessary re-rendering can cause lag.

Remember, useMemo should only be used when dealing with expensive computations as adding it unnecessarily can lead to performance degradation.

Keep experimenting and happy coding! You can find me at @samuellawrentz on X.

This helps me increase the session time of my site. Thank you!

Can you stay a bit longer?