What do you need to observe? Changes to the DOM, data, requests?

RxJS Observables

Create, Subscribe To, Process, & Reuse Observables

RxJS is a library for reactive programming, which put simply, is when you build your program in a way that all it’s doing is reacting to data changes. It’s a subset of event-driven programming and actually, you don’t have to use RxJS for pure reactive programming; it can be used as way of making event driven programming much simpler.

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