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Dart Streams allow you to handle sequences of asynchronous events, such as user interactions, data from a network, or periodic updates. Unlike a Future, which represents a single asynchronous result, a Stream can deliver multiple values over time. This makes Streams especially useful when you need to process a flow of data that arrives at different moments, rather than all at once. You can listen to a Stream's events as they are emitted, letting your program react to each new value as soon as it becomes available.

main.dart


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import 'dart:async';

void main() {
  // Create a Stream that emits integers from 1 to 5, one every second
  Stream<int> numberStream = Stream.periodic(
    Duration(seconds: 1),
    (count) => count + 1,
  ).take(5);

  // Listen to the Stream and print each value as it arrives
  numberStream.listen((value) {
    print('Received: $value');
  });
}

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Sezione 3. Capitolo 1

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Creating and Listening to Streams

main.dart


              1234567891011121314
            
import 'dart:async';

void main() {
  // Create a Stream that emits integers from 1 to 5, one every second
  Stream<int> numberStream = Stream.periodic(
    Duration(seconds: 1),
    (count) => count + 1,
  ).take(5);

  // Listen to the Stream and print each value as it arrives
  numberStream.listen((value) {
    print('Received: $value');
  });
}

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 1