[RxJS] What RxJS operators are

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[RxJS] Chain RxJS Operators Together with a Custom `pipe` Function using Array.reduce

Instead of writing complex operators, it's usually best to write simple, single-purpose operators then chain them together when necessary. The pipefunction takes functions as arguments, invokes each function with the value, then passes the returned r…

[RxJS] What RxJS operators are

We have covered the basics of what is Observable.create, and other creation functions. Now lets finally dive into operators, which are the focus of this course. We will see how operators are simple pure functions attached to the Observable type. var…

[RxJS] Implement RxJS `switchMap` by Canceling Inner Subscriptions as Values are Passed Through

switchMap is mergeMap that checks for an "inner" subscription. If the "inner" subscription exists, switchMap unsubscribes from that "inner" subscription which effectively "cancels" any pending pushes. import { fromE…

[RxJS] Implement RxJS `mergeMap` through inner Observables to Subscribe and Pass Values Through

Understanding sources and subscribers makes it much easier to understand what's going on with mergeMap under the hood. Where a typical operator invokes destination.next directly, mergeMap wraps destination.next inside of a new source/subscriber combo…

[RxJS] Convert RxJS Subjects to Observables

The use of RxJS Subjects is common, but not without problems. In this lesson we will see how they can be usually safely replaced with plain Observables. Check the follow code: const click$ = new Rx.Subject(); document.addEventListener('click', functi…

[RxJS] Use RxJS concatMap to map and concat high order observables

Like switchMap and mergeMap, concatMap is a shortcut for map() followed by a concatAll(). In this lesson we will explore this RxJS operator and its properties. const clickObservable = Rx.Observable .fromEvent(document, 'click'); function performReque…