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re: Daily Challenge #137 - Help the Bookseller VIEW POST

FULL DISCUSSION
 

In javascript

const l = ["ABART 20", "CDXEF 50", "BKWRK 25", "BTSQZ 89", "DRTYM 60"];
const m = ["A", "B", "C", "W"];

const count = m.reduce((o, key) => {
  const c = l.reduce((total, item) => {
    const [code, nr] = item.split(" ");
    return total + parseInt(code.indexOf(key) === 0 ? nr : 0, 10);
  }, 0);
  return { ...o, [key]: c };
}, {});

const printResult = obj => {
  return Object.keys(obj)
    .map(k => `(${k} : ${obj[k]})`)
    .join(" - ");
};

console.log(printResult(count));

CodeSandbox example

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