Two successive setTimeout with rxjs

Delay emitted values by given time.

Observable.of(true)
    .delay(150)
    .do(() => {
        this.renderer.addClass(this.mainContainer, 'side-container');
    })
    .delay(300)
    .do(() => {
        this.renderer.addClass(this.sideContainer, 'open');
    });
==============================
Observable.of(true).pipe(
    delay(150),
    tap(() => {
        this.renderer.addClass(this.mainContainer, 'side-container');
    }),
    delay(300),
    tap(() => {
        this.renderer.addClass(this.sideContainer, 'open');
    })
);