public static function fromArray($arr)
{
$deltasResponseArr = $arr['deltaResponse'];
$state = $deltasResponseArr['state'];
$deltas = array();
$deltasArr = $deltasResponseArr['delta'];
foreach ($deltasArr as $deltaArr) {
$delta = Delta::fromArray($deltaArr);
$deltas[] = $delta;
}
return new DeltaResponse($state, $deltas);
}
