Arrow function works with async and waits in native response

Question

I am trying to save data in AsyncStorageto react-native. I want to keep it asynchronously, using the keyword asyncand await.

  async onPositiveClickListener = () => {
    // user has completed product tour_end
    try {
      await AsyncStorage.setItem("@ProductTour:key", "true");
      const { navigate } = this.props.navigation;
      navigate("DashboardScreen");
    } catch (error) {
      console.log(error);
    }
  };

I get an error while saving the program

SyntaxError: Unexpected token, expected ( (40:32)
  38 |   };
  39 | 
> 40 |   async onPositiveClickListener = () => {
     |                                 ^
  41 |     // save user has completed product tour_end
  42 |     try {
  43 |       await AsyncStorage.setItem("@ProductTour:key", "true");
Hide Stack Trace
SyntaxError: Unexpected token, expected ( (40:32)
  38 |   };
  39 | 
> 40 |   async onPositiveClickListener = () => {
     |                                 ^
  41 |     // save user has completed product tour_end
  42 |     try {

Answer 1

The asynchronous named arrow function must be declared as

const onPositiveClickListener = async () => {
    // user has completed product tour_end
    try {
      await AsyncStorage.setItem("@ProductTour:key", "true");
      const { navigate } = this.props.navigation;
      navigate("DashboardScreen");
    } catch (error) {
      console.log(error);
    }
  };