hi. I have a list with objects with four fields. ...

# getting-started

[necros]

hi. I have a list with objects with four fields. I can group the my list by one field with list.groupBy{it.field1} and it will be like Map{"field1value",List<MyObjects>}. I want to group my list with all four field. I want to make them hierarchical map like

Map<Field1Values, 
         Map<Field2Values,
                               Map<Field3Values,
                                                         Map<Field4Values,List<MyObject>>>>

how can I do it?