passing extraData to FlatList isn't working - react-native

Question

I followed https://facebook.github.io/react-native/releases/next/docs/flatlist.html to make a FlatList and also passed this.state to extraData but still, once I delete an item, the item is still shown. I have also logged this.state to make sure the item is deleted and it indeed did. My code is below:
class DescriptionItem extends React.PureComponent {
render() {
return (
<TouchableOpacity
style={this.props.containerStyle}
onPress={(event) => {this.props.onPress(this.props.value)}}>
<Text style={this.props.style}>{this.props.value}</Text>
</TouchableOpacity>
)
}
}
export default class CardWorkDescriptionsList extends React.PureComponent {
constructor(props) {
super(props);
this.state = {
loading: false,
data: [],
error: null,
refreshing: false,
};
}
_notifyItemSelected(text) {
if(this.props.onItemSelected) {
this.props.onItemSelected(text)
}
}
_onItemSelected = (selectedItem) => {
var array = this.state.data;
var index = array.indexOf(selectedItem)
array.splice(index, 1);
console.log(array)
this.setState({data: array });
console.log("yeah",this.state.data)
this._notifyItemSelected(selectedItem);
}
makeRemoteRequest = () => {
//TODO: fetch data
this.setState({data: descriptionsFake})
}
componentDidMount() {
this.makeRemoteRequest();
}
render() {
return (
<View style={styles.cardLight}>
<FlatList
data={this.state.data}
extraData={this.state}
renderItem={(item) => (
<DescriptionItem
containerStyle={styles.itemContainer}
style={styles.content}
value={item.item}
onPress={(selectedItem)=>this._onItemSelected(selectedItem)}/>
)}
keyExtractor={item => item.substring(0,20)}
/>
</View>
);
}
}

Answer 1

Try extending React.Component instead of PureComponent