Why library management tests CRUD design in LLD - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new book record in the library system.

LLD

def add_book(book_list, book):
    book_list.[1](book)
    return book_list

Drag options to blanks, or click blank then click option'

Aremove

Bappend

Cpop

Dclear

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of append

Trying to pop without index

Clearing the whole list accidentally

To add a new book to the list, we use the append method which adds the item at the end.

2fill in blank

medium

Complete the code to find a book by its ID in the library system.

LLD

def find_book(book_list, book_id):
    for book in book_list:
        if book['id'] == [1]:
            return book
    return None

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Aid

Bbook

Cbook_list

Dbook_id

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing to the whole book object

Using wrong variable names

Comparing to the list instead of ID

We compare each book's 'id' with the given book_id to find the matching book.

3fill in blank

hard

Fix the error in the code to update a book's title by its ID.

LLD

def update_book_title(book_list, book_id, new_title):
    for book in book_list:
        if book['id'] == book_id:
            book['title'] = [1]
            return True
    return False

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Anew_title

Bbook_id

Ctitle

Dbook_list

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning book_id instead of new_title

Using wrong dictionary key

Returning True too early

The new title should be assigned from the new_title parameter, not any other variable.

4fill in blank

hard

Fill both blanks to delete a book by its ID from the list.

LLD

def delete_book(book_list, book_id):
    for i, book in [1](book_list):
        if book['id'] == [2]:
            del book_list[i]
            return True
    return False

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Aenumerate

Bbook_id

Crange

Dbook_list

Attempts:

3 left

💡 Hint

Common Mistakes

Using range without indexing

Comparing to wrong variable

Deleting without index

We use enumerate to get both index and book, and compare with book_id to find the book to delete.

5fill in blank

hard

Fill all three blanks to create a dictionary of book titles and their authors for books published after 2000.

LLD

books_after_2000 = {book['[1]']: book['[2]'] for book in book_list if book['year'] [3] 2000}

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Atitle

Bauthor

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'author' as key

Using '<' instead of '>'

Mixing up keys and values

We want the dictionary keys as title, values as author, and filter books where year is greater than 2000.