Question

Javascript problem:

Given an argument of a list of book objects:

Example test case input:

{

"title" : "Book A",

"pages": "50",

"next": {

"title": "Book B",

"pages": 20,

"next": null

}

}

create a recursive function to return the total number total # of pages read in the list. If there are no books in the list, return 0.

Answer 1

Here is code:

function countPages(book) {

    if (book.next === null) {

        return 0;

    }

    return Number(book.pages) + countPages(book.next);

}

Sample code to test:

function countPages(book) {

    if (book.next === null) {

        return 0;

    }

    return Number(book.pages) + countPages(book.next);

}

let books = {

    "title": "Book A",

    "pages": "50",

    "next": {

        "title": "Book B",

        "pages": 20,

        "next": null

    }

}

console.log(countPages(books));

Output: