public function __construct($sortField, $isAscending)
{
is_string($sortField) === true ?: Exceptions::throwInvalidArgument('sortField', $sortField);
is_bool($isAscending) === true ?: Exceptions::throwInvalidArgument('isAscending', $isAscending);
$this->sortField = $sortField;
$this->isAscending = $isAscending;
}