RxJS - How to get subscriber only new values?

Question

Angular

Hello.

How to make sure that the subscriber does not receive old values, but only expects new ones (in my case, one).

const sbj = new ??Subject<number>();

sbj.next(2);
// Не будет обработан подписчиками

sbj.subscribe(vl => console.log(`1st: ${vl}`));
sbj.subscribe(vl => console.log(`2nd: ${vl}`));

sbj.next(7); 
// 1st: 7
// 2nd: 7

Answer 1

const sbj = new Subject<number>();