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function findAuthorById(authors, id) {

return authors.find((author) => author.id === id);

}

function findBookById(books, id) {

return books.find((book) => book.id === id);

}

//helper function for partitionBooksByBorrowedStatus(books)

function returnedBook(book) {

return book.borrows.every((borrow) => borrow.returned);

}

function partitionBooksByBorrowedStatus(books) {

const booksCheckedOut = [];

const booksReturned = [];

books.map((book) => {

returnedBook(book) ? booksReturned.push(book) : booksCheckedOut.push(book);

});

const bookLog = [[...booksCheckedOut], [...booksReturned]];

return bookLog;

}

function getBorrowersForBook(book, accounts) {

const borrowers = [];

book.borrows.map((borrow) => {

let foundAccount = accounts.find((account) => account.id === borrow.id);

foundAccount = {...foundAccount, returned: borrow.returned};

borrowers.push(foundAccount);

});

return borrowers.slice(0, 10);

}

module.exports = {

findAuthorById,

findBookById,

partitionBooksByBorrowedStatus,

getBorrowersForBook,

};