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Asynchronous programming in Flutter

Adil Essannouni
2 min readMay 25, 2023

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In Flutter, the term “async” is used to mark a function as asynchronous. An asynchronous function is one that can perform time-consuming operations without blocking the execution of the program. It allows you to write code that can handle tasks such as network requests, file I/O, or database operations without freezing the user interface.

When a function is declared as asynchronous using the “async” keyword, it can use the “await” keyword to pause its execution until a particular operation completes. The “await” keyword can only be used within an asynchronous function and is followed by a Future or Stream object. The function will resume its execution once the awaited operation is finished, and it will return the value wrapped in a Future object.

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

Future<void> fetchData() async {
print("Fetching data...");

// Simulating a network request that takes some time
await Future.delayed(Duration(seconds: 2));

print("Data fetched!");
}
void main() {
print("Start");
fetchData().then((_) {
print("Process fetched data");
});
print("End");
}

In this example, we have an asynchronous function fetchData(). It uses the await keyword to pause its execution for 2 seconds, simulating a network request. The function returns a…

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Adil Essannouni
Adil Essannouni

Written by Adil Essannouni

I am Adil Essannouni passionate about sport and web development. I would like to share my modest experience with you

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