splitBeforeIndexed method

*<Null safety>*

Iterable<List<T>> splitBeforeIndexed (bool test(int index, T element))

Implementation

Iterable<List<T>> splitBeforeIndexed(
    bool Function(int index, T element) test) sync* {
  var iterator = this.iterator;
  if (!iterator.moveNext()) {
    return;
  }
  var index = 1;
  var chunk = [iterator.current];
  while (iterator.moveNext()) {
    var element = iterator.current;
    if (test(index++, element)) {
      yield chunk;
      chunk = [];
    }
    chunk.add(element);
  }
  yield chunk;
}