How to call list elements when the list is a parameter in a custom transformer?

Hi @dhaulagiri​ 

I think the transformer ListConcatenator can be helpful for you.

Did you try to use it?

Thanks in Advance,

Danilo

Thank you @danilo_fme​ 

I looked at this transformer but I think it necessarily concatenates all the elements of a list. I must choose the starting index, because depending on the results of the previous treatments, I have to keep all or delete the first, the first two or the first three elements...

Hi @dhaulagiri​ 

Thanks your feedback.

The custom transformer ListSlicer can be help for you.

It's possible to start a index and after create a string ( concatenated process ).

I published the parameter for start index and used before the transformer ListElementCounter ( to get the number of list element generated ).

Attached the Workspace.

Thanks in Advance,

Danilo

 Thanks @danilo_fme​ , this is exactly what I need! I hadn't seen this transformer at all.

But if this solution solves my problem, it doesn't answer my question: I would like to know how to refer to an element of a list passed as a parameter. It might help me one day or another. Anyone know?