searchBooksByDetails(sc: any): Observable<Array<Book>> {
    this.books$ = this.getBooks();
    this.books$ = this.books$.pipe(
      debounceTime(2000),
      map(books =>
        books.filter(
          book =>
            book.title.toLowerCase().includes(sc.title.toLowerCase()) &&
            book.author.toLocaleLowerCase().includes(sc.author.toLocaleLowerCase()) &&
            book.publisher.toLowerCase().includes(sc.publisher.toLowerCase()) &&
            (sc.category === 'ALL' || book.category === sc.category) &&
            (!sc.publishedFrom || book.publicationDate > sc.publishedFrom) &&
            (!sc.publishedTo || book.publicationDate < sc.publishedTo)
        )
      )
    );