single subscription stream example in dart

stream_1

import 'dart:async';

void main() {
  //
  // Initialize a "Single-Subscription" Stream controller
  //
  final StreamController ctrl = StreamController();
  
  //
  // Initialize a single listener which simply prints the data
  // as soon as it receives it
  //
  final StreamSubscription subscription = ctrl.stream.listen((data) => print('$data'));

  //
  // We here add the data that will flow inside the stream
  //
  ctrl.sink.add('my name');
  ctrl.sink.add(1234);
  ctrl.sink.add({'a': 'element A', 'b': 'element B'});
  ctrl.sink.add(123.45);
  
  //
  // We release the StreamController
  //
  ctrl.close();
}