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

Best unique key extractor for react native

function looks like:

  keyExtractor = item => {
    return item.id.toString() + new Date().getTime().toString() + (Math.floor(Math.random() * Math.floor(new Date().getTime()))).toString();  };

or without item fields:

  keyExtractor = () => {
    return new Date().getTime().toString() + (Math.floor(Math.random() * Math.floor(new Date().getTime()))).toString();  };