rxjs5

My backend frequently returns data as an array inside an RxJS 5 Observable (I'm using Angular 2). I often find myself wanting to process the array items individually with RxJS operators and I do so with the following code ( JSBin ): const dataFromBackend = Rx.Observable.of([ { name: 'item1', active: true }, { name: 'item2', active: false }, { name: 'item3', active: true } ]); dataFromBackend // At this point, the obs emits a SINGLE array of items .do(items => console.log(items)) // I flatten the array so that the obs emits each item INDIVIDUALLY .mergeMap(val => val) // At this point, the obs

What is the best practice to unsubscribe within a Angular2 service from a http subscription? Currently I do this but I'm not sure if this will be the best way. import { Injectable } from "@angular/core"; import { Http } from "@angular/http"; import { Subject } from "rxjs/Subject"; import { ISubscription } from "rxjs/Subscription"; @Injectable() export class SearchService { private _searchSource = new Subject<any>(); public search$ = this._searchSource.asObservable(); constructor(private _http: Http) {} public search(value: string) { let sub: ISubscription = this._http.get("/api/search?value="

What is the correct expression and import for Observable.of([]); . import { of } from 'rxjs'; does not work for me. Since RxJS 6 you should import all "creation" observables directly from 'rxjs' (assuming you have path maps set when bundling your app). More detailed explanation: https://github.com/ReactiveX/rxjs/blob/master/MIGRATION.md#import-paths import { of } from 'rxjs'; of(1).subscribe(console.log); See demo: https://stackblitz.com/edit/typescript-e3lxkb?file=index.ts No need to use Observable.of(T) Instead you can use the below syntax in the rxjs 6.3.3 return new Observable<AppUser>();

RxJS 5.5 allows grabbing lettable operators and piping them like so: import { ajax } from 'rxjs/observable/dom/ajax' import { catchError, map, retry } from 'rxjs/operators' ajax.getJSON('https://example.com/api/test') .pipe( retry(3, 1000), map(fetchUserFulfilled), catchError(console.error) ) How would I use the do operator between these commands? The do operator was renamed in RxJS 5.5 to tap because it collided with the JavaScript do keyword. For more info see: https://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md#pipeable-operators 来源： https://stackoverflow.com/questions

I am using Angular 2 HTTP library which returns an observable. I want to implement retry on certain error status/code. I have an issue, if the error is not 429, Observable.of(error) is getting executed in error case to retry, but when all your 2 retry fails the execution of flow goes to success block instead of catch block. How to make execution of flow to catch block in all retry fails? return this.http.get(url,options) .retryWhen((errors) => { return errors .mergeMap((error) => (error.status === 429) ? Observable.throw(error) : Observable.of(error)) .take(2); }) .toPromise() .then((res

Its not 100% clear for me how the RxJs 5 share() operator works, see here the latest docs . Jsbin for the question here . If I create an observable with a series of 0 to 2, each value separated by one second: var source = Rx.Observable.interval(1000) .take(5) .do(function (x) { console.log('some side effect'); }); And if I create two subscribers to this observable: source.subscribe((n) => console.log("subscriptor 1 = " + n)); source.subscribe((n) => console.log("subscriptor 2 = " + n)); I get this in the console: "some side effect ..." "subscriptor 1 = 0" "some side effect ..." "subscriptor 2

I have a RxJS5 pipeline looks like this Rx.Observable.from([2, 3, 4, 5, 6]) .takeWhile((v) => { v !== 4 }) I want to keep the subscription until I see 4, but I want to last element 4 also to be included in the result. So the example above should be 2, 3, 4 However, according to official document , takeWhile operator is not inclusive. Which means when it encounters the element which doesn't match predicate we gave, it completes the stream immediately without the last element. As a result, the above code will actually output 2, 3 So my question is, what's the easiest way I can achieve takeWhile