How can you Sort a stream by timestamp in Reactivex?

问题

I've combined streams from firestore and now I need to sort them by timestamp (descending) . I really don't know much about reactiveX ...I'm using dartRx. I seen a few solutions using a comparator but not really sure how to use it.

Class Order{
Timestamp timestamp;
}

Stream<List<Order>> sortByTimestamp(){
return combineList(order).....//my stream
}

回答1:

thanks for your question. Here is my way :)

return combineList(order).map((orders) => orders.sort(comparator).toList());

来源：https://stackoverflow.com/questions/62986854/how-can-you-sort-a-stream-by-timestamp-in-reactivex