20220308 - Amazon Code Challenge

const boookList = [
  {
    id: 1,
    category: "action"
  },
  {
    id: 2,
    category: "fiction"
  },
  {
    id: 3,
    category: "drama"
  }
];
const bookReviews = [
  {
    id: 1,
    reviews: 130
  },
  {
    id: 1,
    reviews: 30
  },
  {
    id: 2,
    reviews: 12
  },
  {
    id: 2,
    reviews: 2
  },
  {
    id: 3,
    reviews: 1
  }
];

const getCategoryName = (id) => boookList.find((item) => item.id === id);
const categoryReview = bookReviews.map((item) => ({
  ...item,
  name: getCategoryName(item.id).category
}));

const mostReviews = categoryReview
  .reduce((accumulator, current) => {
    const duplicate = accumulator.find((item) => item.id === current.id);
    duplicate
      ? (duplicate.reviews += current.reviews)
      : accumulator.push(current);
    return accumulator;
  }, [])
  .sort((a, b) => b.reviews - a.reviews)[0].name;

console.log(mostReviews);