How to pass multiple objects or values in FlatList extraData

try this:

<FlatList
  numColumns={1}
  data={this.props.artists}
  renderItem={this.renderArtistItem}
  initialNumToRender={15}
  keyExtractor={item => item.id}
  extraData={[this.state, this.props.league]}
/>

As it will work as an array in extra data.