How to use the concatMap function from rxjs

Find comprehensive JavaScript rxjs.concatMap code examples handpicked from public code repositorys.

The RxJS operator concatMap maps each source value to an Observable, then concatenates the values emitted by those Observables and emits them on the output Observable.

apps.js

4
5
6
7
8
9
10
11
12
13
14
const {basename} = require('path')


const monitorApps = () =>
    interval(5000).pipe(
        exhaustMap(() => apps$().pipe(
            concatMap(app => updateApp$(app).pipe(
                delay(5000)
            ))
        ))
    ).subscribe({

45

177

0

index.js

GitHub: 1infiniteloop/roasclickfunnels

47
48
49
50
51
52
53
54
55
56
concatMap((ad_meta_data) => {
    let { ad_id } = ad_meta_data;
    let ad_args = { ad_id, date, user_id, fb_ad_account_id };

    return Facebook.ad.db.get(ad_args).pipe(
        concatMap((ad) => iif(() => !isEmpty(ad), rxof(ad), Facebook.ad.api.get(ad_args))),
        rxfilter(pipe(isEmpty, not))
    );
}),
defaultIfEmpty([])

0

1

+ 57 other calls in file

How does rxjs.concatMap work?

concatMap is an RxJS operator that maps each source value to an observable and then flattens those inner observables into a single observable, emitting values in the order they are received and waits for the current inner observable to complete before subscribing to the next one.

Ai Example

1
2
3
4
5
6
import { of } from "rxjs";
import { concatMap } from "rxjs/operators";

const source$ = of(1, 2, 3);

source$.pipe(concatMap((value) => of(value * 2))).subscribe(console.log);

In this example, concatMap is used to map each value emitted by the source observable source$ to a new observable returned by the function of(value * 2). The resulting observable emits the values 2, 4, and 6, which are logged to the console using the subscribe method.

Other functions in rxjs

Sorted by popularity

rxjs.of is the most popular function in rxjs (6190 examples)

Other popular packages:

Home

About

Privacy Policy