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[RxJS] Use RxJS mergeMap to map and merge high order observables

Like RxJS switchMap() is a shortcut for map() and switch(), we will see in this lesson how mergeMap() is a shortcut for map() and mergeAll(), and learn its arguments for customised behavior. const clickObservable = Rx.Observable .fromEvent(document,…

[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…

[RxJS] Getting Input Text with Map

By default, Inputs will push input events into the stream. This lesson shows you how to use map to convert the input event into the text you actually want. <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta nam…

[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] 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] 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] 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] Implement RxJS `concatMap` by Waiting for Inner Subscriptions to Complete

Unlike mergeMap and switchMap, concatMap focuses on when "inner" subscriptions "complete" by using a "buffer". Each time concatMap receives a value, it adds each value to a "buffer", waits for previous "inner&q…

[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速成 (下)

上一部分: http://www.cnblogs.com/cgzl/p/8641738.html Subject Subject比较特殊, 它即是Observable又是Observer. 作为Observable, Subject是比较特殊的, 它可以对多个Observer进行广播, 而普通的Observable只能单播, 它有点像EventEmitters(事件发射器), 维护着多个注册的Listeners. 作为Observable, 你可以去订阅它, 提供一个Observer就会正常的收…