An interesting `Applicative`-ish way of combining `Event`s about reactive-banana HOT 4 OPEN

@ChrisPenner observed on Twitter that this is basically https://www.learnrxjs.io/learn-rxjs/operators/combination/combinelatest from RxJS. Fun!

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Opinion: on balance I think I am in favor of including cool types like this in reactive-banana proper, rather than a companion library. While it's nice to have a minimal core, coming up with things like Step and Tidings on one's own is far from easy, and if they help users solve real problems in standardized ways, I think we ought to promote them.

As a counterpoint, though, look how sprawling the reflex API is: https://hackage.haskell.org/package/reflex. Part of what I think draws people to reactive-banana is its simplicity.

The challenge of course is to decide where to draw the line, and indeed the line may be at "no additional types beyond Event and Behavior". But if we decide to start adding more syntactic sugar like Step, then I think we just need to find the right place in the module hierarchy, and ideally come up with a compelling, real-world example to include in the documentation.

from reactive-banana.

I'm afraid the Step name is not informative enough. I couldn't get a clue on what is it about until I've read the whole snippet.
It hints about stepper usage, but not the way it is used and what to expect 🤔

Perhaps Latest would be an improvement?

  onDone <- combineLatest do
    beforePick <- latest aoiBeforePick.onImageAcquired
    ...

I like the idea though. Looks handy for implementing various drag-n-drops (:

from reactive-banana.

Another option for types like this and Tidings is to live in a blessed companion package like reactive-banana-extras or reactive-banana-contrib, which has a less-minimal core, but is still full of high-quality stuff, with an API that we make sure doesn't get weird and unwieldly.

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