What is await in Flutter? Write it’s usage.

In Flutter, the keyword await is used in conjunction with the async keyword to handle asynchronous operations.

When you mark a function with the async keyword, it means that the function can perform tasks asynchronously. Inside an async function, you can use the await keyword to pause the execution of the function until a particular asynchronous operation is completed. This allows you to write asynchronous code in a more synchronous style, making it easier to read and understand.

Here’s an example to illustrate the usage of await in Flutter:

void main() {
   

fetchData();

print(‘Fetching data…’);

}

Future<void> fetchData() async {

// Simulating an asynchronous operation that takes some time
await Future.delayed(Duration(seconds: 2));

print(‘Data fetched!’);

}

In the code above, we have a main function that calls the fetchData function. Inside the fetchData function, we use the await keyword before the Future.delayed function call. This tells Dart to pause the execution of the fetchData function until the Future.delayed operation completes.

While waiting for the delay to finish, the control flow returns to the main function, and the line print('Fetching data...') is executed immediately. After the delay of 2 seconds, the await expression resolves, and the execution continues from that point onward. The line print('Data fetched!') is then executed, and the program terminates.

Using await allows you to write code that appears to execute sequentially, even though it involves asynchronous operations. It helps you handle asynchronous tasks in a more readable and structured manner.