Load contact data and put it in html page as contact.last_name, contact.email etc. but need to get email in component.ts page

     public ngOnInit() 
          {
           this._routeSubscription = this._route.params
           .pipe(switchMap(params => {
           if (params.id.toString() === `create`) 
            {
                 this._isCreate = true;
                 return of({});
            }
          return this._contactsService.get(params.id); 
          }))
          .subscribe(contact  => {
            this.contact = contact;
         }); 
    }

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need to get contact.email to compare with edited value in html page, if user change and then change back, do not validate