평균 구하기

평균 구하기

2020.07.28

const reduceHelper = (acc, current, index, arr) => {
  if (index == arr.length - 1) {
    return (acc + current) / arr.length;
  }
  return acc + current;
};
const solution = (arr) => {
  return arr.reduce(reduceHelper);
};

• reduce짱!