I am trying to call to a service on input key-up event.  The HTML  <input placeholder="enter name" (keyup)='onKeyUp($event)'>   Below is the onKeyUp() function  onKeyUp(event) {     let observable = Observable.fromEvent(event.ta...

According to this artcle, onComplete and onError function of the subscribe are mutually exclusive.    Meaning either onError or onComplete events will fire up in my subscribe. I have a logic block which needs to be executed whether I receive an error...

Consider using the zip operator to zip together two infinite Observables, one of which emits items twice as frequently as the other. The current implementation is loss-less, i.e. if I keep these Observables emitting for an hour and then I switch betw...

I ran into an interesting issue today. I'm working on an app where we have file uploads, and we want to implement a progress bar. The app is written using React/Redux/Redux-Observable. I want to dispatch actions for upload progress. Here's wh...

I have a code where for each of the ids I am making an ajax request and processing them as results come in. Here is a simple replica of my actual code and jsfiddle:  var ids = [1,2,3,4,5,6]; var ids$ = (id) => {     return Observable.of(id); }; va...

Experts, please tell me how to make sure that asynchronous initialization in the service constructor is complete when calling other functions in the class?    constructor() {     var sock = new SockJS(this._chatUrl);     this.stompClient = Stomp.over...

I'm trying to use an rxjs observable to delegate, but share, a piece of expensive work across the lifetime of an application.  Essentially, something like:  var work$ = Observable.create((o) => {   const expensive = doSomethingExpensive();   o...

Looking at the definition of combineLatest     Combines multiple Observables to create an Observable whose values are   calculated from the latest values of each of its input Observables.   or     Whenever any input Observable emits a value, it compu...

I'm using websocket to receive data frame from hardware. The data frame is defined like this:  0xbb(head) ---data--- 0xee(tail)  the received data is store in Uint8Array, there maybe multiple frame:  var buffer = new Uint8Array([0xbb,0,0,0,0xee,0...

I believe the following code can be refactored using a flatMap but I cant seem to get it working as desired.   I understand flatMap essentially maps and then flattens, which is perfect for me as I'm using forkJoin so get an array of responses bac...