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오픈채팅방

function solution(record) {
  const userInfo = {};

  return record
    .reduce((acc, recordData) => {
      const [action, uid, nickname] = recordData.split(" ");

      if (nickname) {
        userInfo[uid] = nickname;
      }

      if (action !== "Change") {
        acc.push([action, uid]);
      }
      return acc;
    }, [])
    .map(
      ([action, uid]) =>
        `${userInfo[uid]}${
          action === "Enter" ? "님이 들어왔습니다." : "님이 나갔습니다."
        }`
    );
}

요즘 문득 너무 reduce만 사용하나 싶다.. ㅋㅋ..

References​