JS question

"contentfulArtist.data.data.artistsCollection.items[0].artistMediumsCollection.items.map(item => item.artMediumName).join(", ")"

Is that in contentful? I don't think Webstudion allows functions in the expression editor. Maybe you can just concatenate them with: + ", "

This is a guess without seeing your project.

I guess if I can't use a function in the expression editor maybe I could create a function with embed and then use the expression editor to show the result. I'll see.

I built something like this before... let me look and see if I still have it.

Can you do something like this?

That works except that you get a comma at the end, which in this case I don't want.

Here's a hack to fix that.

1. Add a class to the .item
2. Add a class to the .comma
3. Add <style> embed of:
   .item:last-child .comma { display: none; }

Not the nicest solution, but it will display what you want. (There can't be any other element at the end of the collection, though.)