CODEWITHSUNDEEP
flutterdart
Ooto
Ooto

Reputation: 1247

Dart: I made a function async but still can't use await

I made a function async but still can't use await expression. What am I wrong? My code is like this.

Future<void> _aFunction() async {
  DocumentReference docRef = Firestore.instance.collection('collection').document(docId);

  docRef.get().then((DocumentSnapshot docSnapShot) {
    if (docSnapShot.exists) {
      String ip = await Connectivity().getWifiIP();

Upvotes: 0

Views: 175

Answers (1)

nyarian
nyarian

Reputation: 4365

That's because here is an internal (anonymous) function declaration inside then, which is not async. Actually, await keyword can be thought as a syntactic sugar over then, so it would be convenient to refactor the function like this:

Future<void> _aFunction() async {
  final DocumentSnapshot snapshot = await Firestore.instance.collection('collection').document(docId).get();
  if (snapshot.exists) {
    String ip = await Connectivity().getWifiIP();
    // Rest of the `ip` variable handling logic function
  }
  // Rest of the function
}

Now await keyword corresponds to the _aFunction itself instead of an anonymous function declared inside _aFunction, so it works as expected.

Upvotes: 1

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