daily-challenge-137.js

/* https://dev.to/thepracticaldev/daily-challenge-137-help-the-bookseller-16g4 */

let dailyChallenge = (books, codes) => {
  let bookCodes = codes.reduce((result, code) => {
    books.forEach(book => {
      if (book[0] === code) {
        result[code] = (result[code] || 0) + +book.split(' ')[1];
      } else {
        result[code] = (result[code] || 0) + 0;
      }
    });
    return result;
  }, {});

  let finalCodes = Object.keys(bookCodes)
    .map(key => `(${key} : ${bookCodes[key]})`)
    .join(' - ');

  return finalCodes || '';
};

const books = ['ABART 20', 'CDXEF 50', 'BKWRK 25', 'BTSQZ 89', 'DRTYM 60'];
const codes = ['A', 'B', 'C', 'W'];
let result = dailyChallenge(books, codes);
console.log(result);