import {Subject} from "rxjs/Subject";
        import 'rxjs/add/operator/debounceTime';

        const sub: Subject<number> = new Subject<number>();

        sub.debounceTime(1000).subscribe((value: number) => {
            console.log('subscribe');
            console.log(value);
        });

        sub.next(1);
        sub.next(2);
        sub.next(3);

        setTimeout(() => {
            console.log('firsttimer');
            sub.next(4);
        }, 1100);

        sub.next(5);

        setTimeout(() => {
            console.log('secondtimer');
            sub.next(7);
        }, 2200);