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[unlocked2412]

@ComplexPoint

There are also people here ( @unlocked2412 comes to mind), who have learned JavaScript specifically for macOS scripting, and who might have thoughts on:

• What particular subset of JS makes things easiest (you certainly don't need it all), and
• what approach and materials work best for experimenting with it.

Thank you Rob for the mention. I was in a trip so I couldn't reply.

Adding to your excellent suggestions, I would recommend learning the functional programming paradigm from a book like:

Programming in Haskell - 2nd Edition

You can play around with Haskell and keyboard maestro using my plug-in:

Execute a Haskell Script with Arguments - Plug In Actions - Keyboard Maestro Discourse

Haskell helps developing a good and clear mindset about programming in general. In terms of actual use within macOS and iOS apps, JavaScript is a great option. People from Omni have been developing amazing JavaScript API for their products that work both on macOS and iOS. Other apps have taken a similar route.

Rob's functional JS library:

RobTrew/prelude-jxa: Generic functions for macOS and iOS scripting in Javascript – function names as in Hoogle

provides a rich set of composable functions.

You would find that you can get really far just by composing with a few functions (and the result would be much more maintainable and clear).