See this issue for details: https://github.com/realm/realm-js/issues/306

> Flash forward a year later and I stumbled on the same problem. The Realm JS documentation should have mentioned in more details on how to sort properly in reverse order.
In order to perform sorting in reverse order, the .sorted() method should be invoked via fluent API chaining without intermediary variable assignment
Improper reverse sorting:
let items = realm.objects('Article').filtered('createdAt > $0', twoDaysAgo);
const reverseSortedItems = items.sorted('createdAt', true); //will not work
console.log(reverseSortedItems);
Proper reverse sorting:
const sortedItems = realm.objects('Article').filtered('createdAt > $0', twoDaysAgo).sorted('createdAt', true); //sorted in reverse order by date
console.log(sortedItems)