streamstartwith-in-flutter.dart

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import 'package:async/async.dart' show StreamGroup;
import 'dart:developer' as devtools show log;

extension Log on Object {
  void log() => devtools.log(toString());
}

extension StartWith<T> on Stream<T> {
  Stream<T> startWith(T value) => StreamGroup.merge([
        this,
        Stream<T>.value(value),
      ]);
}

void testIt() {
  Stream.periodic(const Duration(seconds: 1), (i) => i + 1)
      .startWith(0)
      .take(4)
      .forEach((element) {
    element.log();
  }); // 0, 1, 2, 3
}