React Native - Use a keyExtractor with FlatList

Question

I have been getting the:

\"VirtualizedList: missing keys for items, make sure to specify a key property on an item or provide a custom keyExtractor\"
         


        

Answer 1

@Sarantis Tofas has the correct answer. Solved it for me! Two additional notes based on the comments:

1. If you use index then make sure to use index.toString() or you'll get a different warning (Failed child context type - type number supplied to CellRenderer expected string).
2. FlatList will work with index by default if you don't have key properties or a keyExtractor defined, but it will still throw a warning.