How to use the ".rankBy()" and ".sortByValue" in the analytics designer

Dear experts,

can someone please explain me how to use the two functionalities ".rankBy()" and ".sortByValue" on a chart/table?

I'm trying to figure it out, but somehow it doesn't want to work on my chart (live HANA connection).

Chart_1.sortByValue("MyMeasureID",SortOrder.Descending);

Chart_1.rankBy("NotSureWhatToPutHere");

I guess these are quite new functionalities and it seems they are not yet included in the new edition of the Developer handbook.

Thanks.

BR

Peter