Async, Await, and Future Keywords in Flutter | Dart | Asynchronous Programming

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Async, Await, and Future Keywords in Flutter | Dart | Asynchronous Programming | Hindi

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Async, await, and Future are keywords that are used in Dart and Flutter to support asynchronous programming.
Async: The async keyword is used to mark a function as asynchronous. An asynchronous function is a function that can perform a long-running operation without blocking the execution of the program. When an asynchronous function is called, it returns a Future object that represents the eventual result of the function.
Await: The await keyword is used to pause the execution of an asynchronous function until a Future completes. When an asynchronous function is called with the await keyword, the function will pause at that point and wait for the Future to complete before continuing. This allows you to write asynchronous code that looks and behaves like synchronous code, making it easier to read and understand.
Future: The Future class is a core class in Dart that represents a value that may not be available yet. A Future can be used to represent the result of an asynchronous operation, and can be used with the await keyword to pause the execution of a function until the Future completes.
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@prabinlamsal74 Жыл бұрын

Dear beginners in dart and flutter, The example shown in this video doesn't exactly depict how async and await usually work in flutter. void main() async{ print ('"line 1'); await fetchData(); print ('"line 2); } Future fetchData() async{ Future.delayed(Duration(seconds:5), ()=> print("line 2")); } Yes, in this case, the output will be as shown in the video. But this is a really rare senario where the fetchData() function doesn't return anything. If the return keyword is used, then the order of execution will be totally different.The await keyword makes the code below it wait for its execution. That way of execution is generally the normal workflow of asynchronous progamming and this is just a special case where the workflow is quite different. So, please read a separate blog/video about asynchronous programming in dart after watching this video.

@azam_izm 5 ай бұрын

thank you

@acornerofherheart-jr9pl 5 ай бұрын

thanks for the explanation i have used the method but didnt know exact things till today.... helpful for me

@rohittanwar8428 4 ай бұрын

Hy I tried this program by my self and I notice that when I didn't use async , future , await in code still I was getting same result why is that.line 1 and Line 3 was executing before and then l2