But how to order sheets by name or by adding order?

[michaelzh]

But how to order sheets by name or by adding order?

[Rintcius Blok]

Here's how you should be able to order by name:

val sheets: List[Sheet] = ...

Workbook(TreeSet(sheets : _*)(Ordering.fromLessThan[Sheet](_.name < _.name)))

[Rintcius Blok]

Assuming comment above addresses issue. Feel free to reopen if incorrect.