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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _item_to_row(iterator, resource):
 """Convert a JSON row to the native object. .. note:: This assumes that the ``schema`` attribute has been added to the iterator after being created, which should be done by the caller. :type iterator: :class:`~google.api_core.page_iterator.Iterator` :param iterator: The iterator that is currently in use. :type resource: dict :param resource: An item to be converted to a row. :rtype: :class:`~google.cloud.bigquery.table.Row` :returns: The next row in the page. """

    return Row(
        _helpers._row_tuple_from_json(resource, iterator.schema),
        iterator._field_to_index,
    )