How do I set up KeyExtractor in React Native?

How do I set up KeyExtractor in React Native?

To set up KeyExtractor in React Native, you need to define a function that returns a unique key for each item in your list.

Can you show me an example of the KeyExtractor function?

Sure! Here's a simple example: keyExtractor={(item) => item.id.toString()}. This assumes each item has a unique 'id'.

What if my items don't have a unique ID?

If your items don't have a unique ID, you can use the index of the item as a fallback: keyExtractor={(item, index) => index.toString()}.

Are there any performance considerations I should be aware of?

Yes, using unique keys helps React optimize rendering. Avoid using indexes if your list can change, as it may lead to performance issues.