How does the following code work and what are the two taps for?

Question

Angular

There is such a code.

public FormSub$: Subscription;
    public Form$: Subject<DynamicForm>;
    public Form: FormGroup;
    
    this.Form$ = new Subject<DynamicForm>();
    this.Form = new FormGroup({});
    ngOnInit(): void {
    		this.dynamicFormSub$ = this.dynamicFormService.getDynamicForm()
    			.pipe(
    				tap(response => this.dynamicForm.next(response)),
    				tap(response => {}));
    }).subscribe();

If I understood this code correctly, it expects data from `this.dynamic Form Service.getDynamicFrame()` then I don't understand why we use tap twice and what do we expect on the second tap?

Where `getDynamicForm` is:

getDynamicForm(): Observable<DynamicForm> {
    		return this.http.get<DynamicForm>(`form`, {
    		})
    		.pipe(
    			map(response => this.get(response)),
    
    		);
    	}

Why do we use a file read subscription if it only happens once:

this.dynamicFormService.getDynamicForm()
      .pipe()).subscribe() {})
    }

Answer 1

why do we use tap twice and what do we expect on the second tap?

nothing. worth removing.
And generally enough

this.dynamicFormSub$ = this.dynamicFormService.getDynamicForm().subscribe(this.dynamicForm);

Although the subject in the component is also not needed, this is shit code.

Why do we use a file read subscription if it only happens once

For the request to be fulfilled, it is necessary to subscribe. Subscription "launches" a cold observable.
Worth reading https://habr.com/en/post/490988/