Examples using "List of things:join with"

Does anyone have any examples using “List of things:join with ...”.

The manual explanation is rather short.

It concatenates a list of string with a separator in between each string:
if the list is ["hello", "world"] and you set $$ as separator you get hello$$world.
You can easily try this operator with a text element and see the result.

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It is super useful for generating JSON arrays.

On a more mundane level, listing out tags or categories with commas.

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