오픈채팅방

const actionType = {
  Enter: "들어왔습니다.",
  Leave: "나갔습니다.",
};
const actionType = {
  Enter: "들어왔습니다.",
  Leave: "나갔습니다.",
};
function solution(record) {
  const uidActions = [];
  const answer = [];
  const userObj = {};
  for (let i = 0; i < record.length; i++) {
    const [action, uid, userName] = record[i].split(" ");
    if (action == "Change") {
      userObj[uid] = userName;
    } else if (action == "Enter") {
      userObj[uid] = userName;
      uidActions.push([uid, actionType[action]]);
    } else if (action == "Leave") {
      uidActions.push([uid, actionType[action]]);
    }
  }
  for (let i = 0; i < uidActions.length; i++) {
    const [uid, actionStr] = uidActions[i];
    const userActionStr = `${userObj[uid]}님이 ${actionStr}`;
    answer.push(userActionStr);
  }
  return answer;
}