tap() isn't triggered in RXJS Pipe

Question

I have to ways of doing the same thing, although I prefer the first one. But the first approach doesn\'t seem to work. (the tap() is not triggered)

Answer 1

pipe creates new Observable thus you must asssign it and then subscribe to that isntance. In your case you are ommiting pipe return thus you end up with plain, unmodified Observable without any extra pipe actions.

Also remember that most likely you will have to subscripbe in order to pipe (and tap) to work.

try

this.actions$=this.actions$.pipe(
    tap(()=>console.log("First tap")),
    ofType(LayoutActions.Types.CHANGE_THEME),
    takeUntil(this.destroyed$),
    tap(() => {
        console.log('Last tap')
    }),
);

this.actions$.subscribe(() => {
    console.log('subscribtion')
});