Reactive forms: mark dirty all controls in form group

I have Angular 6 app with form. Here is an examle

export class ExampleComponent implements OnInit {
form: FormGroup;

constructor(private fb: FormBuilder) { }

ngOnInit() {
this.form = new FormGroup({
first: new FormControl(),
last: new FormControl()
});

this.markControlsAsDirty(this.form);
}

markControlsAsDirty(form: FormGroup) {
this.form.get('first').markAsDirty();
this.form.get('last').markAsDirty();
}
}


I don't want to get a single control and mark every field. Can I mark all controls in form group as dirty?

UPDATE I've been added stackblitz example to show that two previous answers were wrong

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