Call a function every 10 seconds Angular2

A better solution than setTimeout in an Angular app could be to use Observable. Observable have a method named timer that you can use this way (and there is a TimerObservable too but I never used it so I don't know if this is the same thing):

timer = Observable.timer(initialDelay, period);

timer.subscribe(tick => {
   // Your API call, which will be performed every period
});

I encourage you to use RxJS and Observable for your requests too, instead of promises, it seams more the Angular way to do things to me, and RxJS is a really powerful library.

RxJS Observable doc

from RxJS 6+ you just use interval.

import { interval } from 'rxjs';

//in 10 seconds do something
interval(10000).subscribe(x => {
    this.myFunctionThatDoesStuff();
});

you can use Subscription with the interval.

import { interval, Subscription} from 'rxjs';
export class intervalDemo{
    mySubscription: Subscription

    constructor(){
    this.mySubscription= interval(5000).subscribe((x =>{
                this.doStuff();
            }));
    }
    doStuff(){
        //doing stuff with unsubscribe at end to only run once
        this.failedRequestSub.unsubscribe();
    }
}

Better use observables

this.sub = Observable.interval(10000)
    .subscribe((val) => { console.log('called'); });

to stop it use

this.sub.unsubscribe();

Make sure to import interval with

import 'rxjs/add/observable/interval';