Are there any stream combinator libraries for dart?

Question

Does anyone know of any stream combinator libraries for dart? Things like joining multiple Stream into one Stream, split, combine(Stream, Stream) -> Stream<(A, B)>, etc.

Answer 1

I'm not aware of a stream combinator library, but you could try to use StreamController to join streams.

Stream join(Stream a, Stream b) {
  var sc = new StreamController();
  int countDone = 0;
  done() {
    countDone++;
    if (countDone == 2) {
      sc.close();
    }
  }
  a.listen((e) => sc.add(e), onDone: done);
  b.listen((e) => sc.add(e), onDone: done);

  return sc.stream;
}

Warning: untested code.

Answer 2

Check out my library Frappe. It's loosely inspired by Bacon.js, and has a bunch of methods for combining streams.