Flutter Interview Questions and Answers

Ques 1. What is the purpose of the 'async' and 'await' keywords in Dart/Flutter?

'async' and 'await' are used for handling asynchronous operations in Dart/Flutter. 'async' is used to mark a function as asynchronous, and 'await' is used to wait for the result of an asynchronous operation.

Example:

Future fetchData() async {
  var data = await fetchDataFromServer();
  print('Data: $data');
}

Ques 2. Explain the concept of 'State Management' in Flutter.

State management in Flutter involves handling and updating the state of a widget. There are various approaches to state management, including 'setState,' 'Provider,' 'Bloc,' and 'GetX,' each with its own advantages and use cases.

Ques 3. Explain the purpose of 'async* ' in Dart.

'async*' is used to define asynchronous generators in Dart. It allows the function to produce a sequence of values over time using 'yield' and is commonly used with streams and asynchronous iteration.

Example:

Stream generateNumbers() async* {
  for (int i = 0; i < 5; i++) {
    await Future.delayed(Duration(seconds: 1));
    yield i;
  }
}

Ques 4. What is the purpose of the 'InheritedWidget' in Flutter?

The 'InheritedWidget' is a widget in Flutter that allows the efficient propagation of data down the widget tree. It is often used for sharing application-wide state or configuration without passing it explicitly through the widget tree.