List.AddItemToFront behavior with Empty List

Hi guys,
i simply want to merge those 2 lists at their respective index but i have the feeling that the empty list is creating a mess :slight_smile:

Hi @Daniel_Hurtubise

Is this what you’re looking to get?

Looks correct to me. You’re just inserting a list at the front of another list, not “joining” them. As Kulkul shows above, you just need to flatten your new sublists.

I finally managed to get it done using List@Level and keep the list structure