Is RxJS worth learning?

I would say yes . Especially if you are thinking of learning Angular. because Angular heavily use RXJS component, specially Observables. It is worth notice that so far Observable are the best way of handling asynchronous data in javascript.

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What is RxJS and use of this?

The full form of RxJS is Reactive Extension for Javascript . It is a javascript library that uses observables to work with reactive programming that deals with asynchronous data calls, callbacks and event-based programs. RxJS can be used with other Javascript libraries and frameworks.

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