React Native – CSS :last-child without a border?

You could achieve this using some logic:

return books.map((book, i) => {
  return(
    <View style={ (i === books.length - 1) ? styles.noBorderBook : styles.book} key={i}>
      <Text style={(i === books.length - 1) ? styles.noBorderBook : styles.book}>{book.title}</Text>
    </View>
  );
});

What this does is check if i, the iterator, is equal to the books array’s length - 1.