从数组中删除特定项目，无法按预期工作

Question

can someone tell me what is the problem with deleting an item from the array? In deleteSingleItemHandler with axios.delete method it works like it should and on firebase deletes exactly the selected item but when i want to remove item from state array, it removes an item but not the exactly selected one, example, i click on the third item, on firebase it deletes the third item and it removes second on my devices screen... What am I doing wrong?

Thanks in advance! Cheers

class HistoryScreen extends Component {
  state = {
    orders: []
  };

  componentDidMount() {
    axios
      .get(".../orders.json")
      .then(response => {
        const fetchedOrders = [];

        for (let key in response.data) {
          fetchedOrders.push({
            ...response.data[key],
            id: key
          });
        }

        this.setState({ orders: fetchedOrders });

      });
  }

  deleteSingleItemHandler = id => {
    axios
      .delete(`...orders/${id}.json`)
      .then(response => {
        console.log(response);
      });

    const newArray = [...this.state.orders];
    newArray.splice(id, 1);

    this.setState({ orders: newArray });
  };

  render() {
    return (
      <View style={styles.container}>
        <ScrollView>
          <View style={styles.completeOrder}>

              {this.state.orders.map(order => {
              return (
                <TouchableOpacity
                  key={order.id}
                  onPress={() => this.deleteSingleItemHandler(order.id)}
                >
                  <View style={styles.singleItem}>
                    <View style={styles.orderItem}>
                      <View style={{ flex: 1, marginLeft: 5 }}>
                        <Text style={{ fontFamily: Fonts.GloriaHallelujah }}>
                          {order.articleName}
                        </Text>
                      </View>

                      <View
                        style={{
                          flex: 1,
                          justifyContent: "flex-end",
                          flexDirection: "row",
                          marginRight: 5
                        }}
                      >
                        <Text>{order.articlePrice}</Text>
                      </View>
                    </View>
                  </View>
                </TouchableOpacity>
              );
            })}
          </View>
        </ScrollView>
      </View>
    );
  }
}

Answer 1

The first param of the function Array.prototype.splice is an index.

Use the function Array.prototype.findIndex

newArray.splice(newArray.findIndex(o => o.id === id), 1);

Or you can filter that object using the function Array.prototype.filter

newArray = newArray.filter(o => o.id !== id);