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오픈채팅방 코드 리뷰

const splitRecords = getSplitRecords(record);

const commands = {
  'Enter': '님이 들어왔습니다.',
  'Leave': '님이 나갔습니다.',
};

const solution = record => {
  const records = splitRecords(record);
  const userInformation = getUserInfo(records);
  return getChatRecord(records, userInformation);
};

// reduce 대신 map이 더 적합할 것 같습니다.
const splitRecords = records => records.map(splitWith(' '));

// 코드가 한 줄일 때 리턴을 생략할 수 있습니다.
const getUserInfo = records =>
  records.reduce((userInfo, [_, userId, nickname]) => ({
    ...userInfo,
    [userId]: nickname || userInfo[userId],
  }), {});

const getChatRecord = (records, userInfo) =>
  records.reduce((chatRecord, [command, userId]) =>
    command === "Change"
      ? chatRecord
      : [...chatRecord, `${userInfo[userId]}${commands[command]}`], []);

// curried function을 사용했습니다.
// See also: https://hannut91.github.io/blogs/curried
const splitWith = (seperator) => (str) => str.split(seperator);

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