Provide a numerical representation of how frequently one object value is found within another object value

Question

Provide a numerical representation of how frequently one object value is found within another object value

Account Object Example in the Accounts Array:

const accounts = [
  {
    id: "5f446f2ecfaf0310387c9603",
    picture: "https://api.adorable.io/avatars/75/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0e6b7d7a666b7c"/>[email protected]</a>",
    age: 25,
    name: {
      first: "Esther",
      last: "Tucker",
    },
    company: "ZILLACON",
    email: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="365345425e5344184/>[email protected]</a>",
    registered: "Thursday, May 28, 2015 2:51 PM",
  },

Book Object Example in the Books Array:

const books = [
  {
    id: "5f447132d487bd81da01e25e",
    title: "sit eiusmod occaecat eu magna",
    genre: "Science",
    authorId: 8,
    borrows: [
      {
        id: "5f446f2e2cfa3e1d234679b9",
        returned: false,
      },
      {
        id: "5f446f2ed3609b719568a415",
        returned: true,
      },
      ...
      
    ],
  },

I am trying to create a function that will count how many times an account's ID appears in any book's borrow array.

This is my current attempt at the function:

function getTotalNumberOfBorrows(account, books) {
  const accId = account.id;
  let idBorrowed = books.filter((book) => accId === book.borrows.id);
  return idBorrowed.length;
}

However, I am getting 0 as the result instead of the expected 2. As a learner of advanced functions, I have been advised to utilize find, filter, map, reduce, and destructuring objects when necessary. Any guidance or advice would be greatly appreciated. Thank you!

javascript arrays function javascript-objects higher-order-functions

Answer 1

Answer №1

In order to access the id properties of each borrowing, you must iterate through the borrows array.

function calculateTotalBorrows(account, books) {
  const accId = account.id;
  let total = 0;
  books.forEach(book => book.borrows.forEach(borrow => accId === borrow.id && total++));
  return total;
}

Answer 2

In order to access the id properties of each borrowing, you must iterate through the borrows array.

function calculateTotalBorrows(account, books) {
  const accId = account.id;
  let total = 0;
  books.forEach(book => book.borrows.forEach(borrow => accId === borrow.id && total++));
  return total;
}

Answer 3

Answer №2

If you find yourself in need of utilizing more complex functions, here's an alternative approach:

function calculateTotalBorrows(userAccount, libraryBooks) {
  const { id: userID } = userAccount;

  return libraryBooks.reduce((totalBorrows, book) => {
    return (
      totalBorrows +
      book.borrows
        .filter(borrow => borrow.id === userID)
        .reduce((borrowCount, borrow) => borrowCount + 1, 0)
    );
  }, 0);
}

Experiment with this code on Stackblitz

Answer 4

If you find yourself in need of utilizing more complex functions, here's an alternative approach:

function calculateTotalBorrows(userAccount, libraryBooks) {
  const { id: userID } = userAccount;

  return libraryBooks.reduce((totalBorrows, book) => {
    return (
      totalBorrows +
      book.borrows
        .filter(borrow => borrow.id === userID)
        .reduce((borrowCount, borrow) => borrowCount + 1, 0)
    );
  }, 0);
}

Experiment with this code on Stackblitz

Provide a numerical representation of how frequently one object value is found within another object value

Answer №1

Answer №2

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