What are the best practices for using React.memo?

What are the best practices for using React.memo?

React.memo is a higher-order component that helps optimize performance by memoizing functional components. Best practices include using it for components that render the same output given the same props, avoiding it for components that frequently change, and ensuring that props are stable.

Can you give an example of when to use React.memo?

Sure! If you have a list of items that rarely change, you can wrap the list item component with React.memo. This way, it won't re-render unless its props change, improving performance.

Are there any downsides to using React.memo?

Yes, if used incorrectly, it can lead to unnecessary complexity and may even degrade performance if the memoization logic is more expensive than re-rendering the component.

How does React.memo compare to PureComponent?

React.memo is for functional components, while PureComponent is for class components. Both optimize rendering by preventing unnecessary updates, but they are used in different contexts.