Angular 7 docs provide this example of practical usage of rxjs Observables in implementing an exponential backoff for an AJAX request:  import { pipe, range, timer, zip } from 'rxjs'; import { ajax } from 'rxjs/ajax'; import { retryWh...
I would like to know how to create a new observable that will return one of two other observables based on if the first observable is empty (without calling the second observable by default).  Eg:    // scenario 1 let obs1 = Observable.empty(); let o...
I am trying to call a Method in my Component from a a Service. What is the proper way to do this? I have tried to use rxjs Subject to create an Observable, but I cannot get it to fire.  import {Subject} from 'rxjs/Subject';     export class M...
For arbitrary promise implementation, the deferred pattern (not to be confused with antipattern) may may look like:  const deferred = new Deferred; ... // scopes where `deferred` object reference was passed before promise settlement deferred.promise....
I'm borrowing some code from this stackoverflow: Angular window resize event The author of the answer says I should be using the EventManager if I want to listen for window events from a service and not break Angular Universal.  That being said,...
I use mobx library. It fit well with ReactJS. I have and observable array like this:  @observable items = [];   When I add an object in this way, I have no problem and the given object will be observable as expected.  let x = { Title: "sample tit...
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 have the following code to implement Observable Memory Store  var inventory = [     {name:"shoes", quantity:10, category:"sales"},     {name:"clothes", quantity:5, category:"sales"},     {name:"hats", quantit...
I have created to sum the costs between each other but now I need to sum all the budget for complete year. I have tried this but this is not working it is showing me undefined.  Costs is an interface that has a variable created of type date and the v...
I was using EventEmitter and @Output in Angular services, today one of the coleagues mentioned it's not a good practice.  I found this post mentioning it's a bad practice and it seems mostly is personal opinion, and this answer is mentioning...

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