How to List All Windows of One App That Are Open in All Desktops

[ComplexPoint]

@August

what the use strict and return constructions do in this case

See:

Comparing JavaScript for Automation (JXA) and AppleScript

That's right – JavaScript interpreter environments, like Script Editor, and the JavaScript console in browsers, generally have a persistent global name space, containing a whole lot of definitions. It's a crowded space. You can see its contents by running the following one-word JS script in Script Editor: this (You will see a lot of crowded detail appearing in the Script Editor Results panel) If you don't write your code definitions inside a function wrapping, they are just added to this alr…

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an appropriate name for the operation

Yes, a user-defined function like that would work as well by any other name.