splitW method

Implementation

Iterable<String> splitW(String sep) sync* {
  if (!contains(sep)) {
    yield this;
    return;
  }

  List<String> pieces = split(sep);
  for (int i = 0; i < pieces.length; i++) {
    if (i == pieces.length - 1) {
      yield pieces[i];
    } else {
      yield "${pieces[i]}$sep";
    }
  }

  if (pieces.isEmpty) {
    yield this;
  }
}