// number-parser3.js
let total = 0;

const totalSoFar = () => {
    return total;
};

const logger = makeLogger();

const sum = (numbers) => {
    const [a, b] = numbers.split(',');

➊

    logger.info('this is a very important log output', {
        firstNumWas: a,
        secondNumWas: b,
    });

    const result = Number.parseInt(a, 10) + Number.parseInt(b, 10);
    total += result;
    return result;
};

➊ 새롭게 추가한 종료점이다.