“Observables are a function that take an observer and return a function.”

Alex Mills

11

“A Monad is just a monoid in category of endofunctors, what is the problem?”: http://stackoverflow.com/questions/3870088/a-monad-is-just-a-monoid-in-the-category-of-endofunctors-whats-the-proble%E2%85%BF

I understand the “observer” here is more of a technical implementation than a concept. Conceptually, the function you pass to the Promise is also an observer. But here they mean it in the more specific `RxJX`

contexts, where the observer object is required to conform to their api. But plain functions would be simpler to use, in my view.