I believe Signals are the go-to now, but surely RxJS is still present for complex use cases. Are Zones fully gone?
I would be more happy if it would be just one of those..
Promised - async
Observables - streams
Signals - reactivity
> Signals - reactivity
The r in rx stands for reactive.
I suppose we can say that there are different kinds of reactivity. Signals is one kind. Observables à la rxjs is a different kind (the whole model of programming with rxjs was referred to as "functional reactive programming"). Observables are push-based. Signals, as I heard, are a more complex primitive, which, under the hood, is push-pull.
React's reactivity model may be crap; but this doesn't make it non-existent.
Since react doesn’t have a true reactive model, you need to subscribe to changes manually (use effect) to create computations, while in signals it’s a primitive (computed).
I actually created a lib that operates signals over reacts state management (https://roypeled.github.io/react-logic/), so I removed the boilerplate to create a true reactive system.
If you want, you can create reactive system just from JS primitives, using callbacks. But that doesn’t make JS reactive by nature.
How do you mean? Since the render function reruns during every update to state/props, derived/computed values can be calculated from the updated state/props during rendering.
"The react in react stands for reactivity, however it is not." [because] "Its entire state management is not reactive"
React is primarily an UI library, not full state management library. And its UI is reactive.
Until this release (if you only use stable features) using forms meant dealing with observables too, even if you just want to read data when submitting a form and validating some data on change/blur.
And often you’ll find that your data from promises, observables and signals need to interact with each other, which can be annoying.
Fortunately the situation with signals and their async usage is improving, and iirc the Angular team wants to make rxjs optional, but until it is Angular can be a confusing mess on some points.
Regarding angular I agree, rxjs was a bad choice for data management, and before signals arrived I abandoned rxjs in favor of mobx in my angular projects. However you could roll your own http client, we used axios, and using DI it’s a drop in replacement.