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By “event-oriented” I mean that everything is reactive & concurrent. Some example code: for all b in (bullets) { whenever (colliding (b, player)) { player.health <- player.health - b.power; destroy (b); } } when (player.health <= 0) { game_over (); }
Is there a language that can express concurrent, independent whenever-predicate? I’d subscribe to that newsletter.
You can look at the old C++ implementation¹ (pull-based semantics—checks every event condition every step) or the in-progress Haskell rewrite² (push-based—only checks conditions that depend on variables that were changed). ¹ https://github.com/evincarofautumn/hap … ²https://github.com/evincarofautumn/hap-hs …
There’s a lot happening beyond my ken here. Sober reflection required.
“for all” is also intended to quantify over a container at all points in time: whenever an object is added to or removed from the container being observed, event listeners are added or removed accordingly.
Indeed. Which means that said machinery implements a great deal of fidgety things we’d all love to abstract. But can/has it be/en done practicably?
I don’t think it has; that’s why I’m writing Hap. 
Basically, Hap = spreadsheets + equating variables with cells + executing code in response to changes.
I’ve heard good things about Rx <https://github.com/dotnet/reactive > but don’t know how similar it is. See also: FRP (e.g. netwire).
Rx is pretty obviously (in my opinion, as expressed in extant UI frameworks, with high uncertainty) a dead end. I think FRP has ideas yet to be mined profitably.
I have a feeling reflex would be able to do something like that. It’s quite steep in terms of learning curve though.
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