위장

위장

2020.07.31

const reduceHelper = (acc, [cloth, category]) => {
  if (!acc.hasOwnProperty(category)) {
    acc[category] = [cloth];
  } else {
    acc[category].push(cloth);
  }
  return acc;
};

const solution = (clothes) => {
  const hash = clothes.reduce(reduceHelper, {});
  let result = 1;
  for (const category in hash) {
    result *= hash[category].length + 1;
  }
  return result - 1;
};

• 너무 풀기만 하면 그만이라는 식으로 짠 것 같아서 리팩토링 해보았다.

const reduceHelper1 = (acc, [cloth, category], idx, origin) => {
  if (!acc.hasOwnProperty(category)) {
    acc[category] = 1;
  } else {
    acc[category]++;
  }
  if (idx == origin.length - 1) {
    return Object.values(acc);
  }
  return acc;
};

const reduceHelper2 = (acc, current, origin, length) => (acc *= current + 1);

const solution = (clothes) => {
  return clothes.reduce(reduceHelper1, {}).reduce(reduceHelper2, 1) - 1;
};