Angular 6 run a function in every X seconds

Try to use setInterval

setInterval will allow to run a function regularly with the interval between the runs

https://javascript.info/settimeout-setinterval

Example:

function opensnack(text: string) : void {
  console.log(text);
}

setInterval(opensnack, 10000, "my text"); <-- run every 10 second

You can look at this stackblitz example:

You can make use of rxjs library to run a function every X seconds.

import { interval } from 'rxjs';
import { takeWhile } from 'rxjs/operators';

...

 interval(1000)
    .pipe(takeWhile(() => !stop))
    .subscribe(() => {
      // place you code here
    });

The above code snippet will execute the subscribed statements every 1 second, until the stop condition becomes true.

Use interval from rxjs

Here's how:

import { interval, Subscription } from 'rxjs';

subscription: Subscription;

...

//emit value in sequence every 10 second
const source = interval(10000);
const text = 'Your Text Here';
this.subscription = source.subscribe(val => this.opensnack(text));

...

ngOnDestroy() {
  this.subscription.unsubscribe();
}

Alternatively, you can use setInterval which is available as method on the Window Object. So you don't need to import anything to use it.

intervalId = setInterval(this.opensnack(text), 10000);

...

ngOnDestroy() {
  clearInterval(this.intervalId);
}

Here's a SAMPLE STACKBLITZ for your ref.