import { Injectable } from '@angular/core';

import { Books } from 'src/assets/data/book.interface';

@Injectable({

providedIn: 'root'

})

export class BooksService {

______(Q1)___________________;

constructor() { }

addToReadingList(book:Books) {

this.readingBooks.push(book);

}

getReadingList() {

______(Q2 )___________________;

}

}

1. Two methods addToReadingList() and getReadingList() are created in the service file books.service.ts. They are used to add a book to the reading list, and to get all books in the reading list respectively. Which of the following codes should be used to fill in the blank at (Q21)?

1. private books: books[ ];
2. private readingBooks: Books;
3. private readingBooks: Books{ };
4. private readingBooks: Books[ ]=[ ];

2. Which of the following codes should be used to fill in the blank at (Q22)?

1. return this.readingBooks.push();
2. return this.readingBooks.splice();
3. return this.readingBooks.slice();
4. return this.readingBooks.display();