rxjs

问题 I'm using RxJS here and I can't seem to get over this seemingly simple issue. rx.Observable .from([1,2,3,54,3,22,323,23,11,2]) .distinct() .subscribe(function next (x) { console.log('Next'); console.log(x); }, function error (x) { console.log('Error'); console.log(x); }, function completed () { console.log('Completed'); }); The above code spits out each array item in order as expected. rx.Observable .fromPromise(getNumbers([1,2,3,54,3,22,323,23,11,2])) .distinct() .subscribe(function next (x)

问题 How would you delay .forkJoin() in rxjs? Here is what I've got but want to use delay() operator with that? return forkJoin( this.call1(), this.call2(), this.call3() ); So far I got this: return of(null).pipe( delay(5000), switchmap(() => this.call1()), switchmap(() => this.call2()), switchmap(() => this.call3())) ); That is worked but I would like to use forkJoin, i tried the other soluton return forkJoin( of(this.call1()).pipe(delay(5000)), of(this.call2()).pipe(delay(5000)), of(this.call3()

问题 I must admit that I am doing my first steps with Angular2, and I am running into an issue here, which I have some problems understanding. I am using angular2@2.0.0-beta.0, which has a dependency on rxjs@5.0.0-beta.0. My intention is to make an HTTP request (to a REST service) and allow the response to be sent to multiple subscribers of the returned observable. If I understand the documentation correctly, I can use the publish() function to convert the Observable returned by e.g. the http.post

问题 Ok, so I'm a complete beginner with Rx and unfortunately very new to js and streams in js as well. Im using this https://github.com/trygve-lie/twitter-stream-api to connect to twitters streaming api and receive json objects with tweets. So far I have this code var Rx = require('rxjs/Rx'); var TwitterStream = require('twitter-stream-api'), fs = require('fs'); var filter = 'tweet'; var keys = { consumer_key : "key", consumer_secret : "secret", token : "token", token_secret : "tokensecret" };

问题 According to https://github.com/ReactiveX/rxjs/blob/master/doc/writing-marble-tests.md '--(abc)-|': on frame 20, emit a, b, and c, then on frame 80 complete So how do I represent "on frame 20, emit a, b, and c, then on frame 40 complete. Ie how can I stop the sync group itself taking up frames? 回答1: cartant has answered this question in his comment. There's no way to do it - sync groups will always take up extra frames even though all members occur in the frame of the opening bracket. 来源：

问题 I'm calling the web api to check if an urlalias is available, for this task I'm using a httpservice in my async validator. The issue is that when the validator is called, all the correct code path is performed (all the console.log() run and behave as expected). Whether the promise from the validation returns/resolves to null or an { 'isUrlAliasActivityMainAvailable': true } , the controller always shows an error object as following, thus keeping the form state as invalid, why (bloody hell!)?

问题 I have two observables and I want listen to the one that emits its first value last, is there an operator for this ? Something like that : let obs1 = Rx.Observable.timer(500,500); let obs2 = Rx.Observable.timer(1000,1000); // I want the values from this one let sloth = Rx.Observable.sloth(obs1,obs2); where the sloth observable would emit the values from obs2 as it is the one who emits its first value last. If that's not the case, is there any other way ? 回答1: I like your solution (though I

问题 I am using the Azure AD adal library to do authentication. There is a call to aquire a token that returns an observable. How can this observable be added into the intercept? In the below example, how can I get the request that is set inside the subscribe to be returned as the Observable? intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { this.authAzureService.getAccessToken() .subscribe(token => { // I need this to be returned request = this

问题 I'm trying to use ionic native plugin geolocation in ionic 4 but I got a this error: Failed to compile. ./node_modules/@ionic-native/geolocation/index.js Module not found: Error: Can't resolve 'rxjs/Observable' in 'C:\Projects\ionic\prayers\node_modules\@ionic-native\geolocation' this is my dependencies: "dependencies": { "@angular/common": "6.0.9", "@angular/core": "6.0.9", "@angular/forms": "6.0.9", "@angular/http": "6.0.9", "@angular/platform-browser": "6.0.9", "@angular/platform-browser