await in Flutter

In Flutter, we use the await keyword whenever we need to run a specific function or assign a value before proceeding. The await keyword plays a major role in executing a specific function, whether that function is calling an API, or storing data, retrieving data locally( like set or get from sharedPrefernces), etc.

await keyword conjunction with the async keyword to perform asynchronous operations.

Asynchronous operations are crucial for tasks that may take time to complete, such as network requests, file I/O, or database queries.

Network Request where await is required:-

Whenever we use await keyword async keyword also require in function

Future<void> fetchData() async {
//Here we use await 
  var response = await http.get('https://api.example.com/data');
  print('Response: ${response.body}');
}

In this case hello will print after 5 seconds of start print and to implement this functionality we require await with Future.delay

Future<void> delayedOperation() async {
  print('Start');
  await Future.delayed(Duration(seconds: 5));
//Hello print after 5 seconds
  print("Hello");
  print('After 2 seconds');
}

In this case try catch is used when exception may be occurs while calling API

Future<void> fetchData() async {
//await with try catch 
  try {
    var response = await http.get('https://api.example.com/data');
    print('Response: ${response.body}');
  } catch (e) {
    print('Error: $e');
  }
}

Multiple await within an async function

Future<void> processMultipleSteps() async {
//multiple await 
  var result1 = await step1();
  var result2 = await step2(result1);
  print('Results: $result1, $result2');
}

Overall await is very important keyword and it is used in API calling, data storage, handling data flow and many other cases. When storing data through shared preference in flutter, await is always used, to see an example of shared preferences fetchSharePrefData() where await keyword is used, click here