Le dimanche 02 juillet 2023 à 15:05 -0400, Pierre-Luc Gauthier a écrit :
> How can I go about using for-each in this example for the group function to
> accept an arbitrary number of parts ?
You can't — for-each is not the right tool for this. for-each is a purely
imperative tool: it runs the same operation on each element of a list, and
discards the result. What you actually want is called list splicing:
```
\version "2.25.6"
parts = #(list
#{ {c'} #}
#{ {d'} #}
#{ {e'} #}
#{ {f'} #} )
group =
#(define-music-function
(parts) (list?)
#{\new StaffGroup << #@parts >>#})
\group \parts
```
See
https://extending-lilypond.gitlab.io/en/extending/intro.html#inserting-scheme-inside-lilypond
Best
Jean
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