오픈채팅방 / 심화

Author: oh-chaeyeon

oh-chaeyeon/4주차_해시/오픈채팅방.js

@@ -0,0 +1,22 @@
+function solution(record) {
+  const nicknames = {};
+  const result = [];
+
+  record.forEach((entry) => {
+    const [action, userId, nickname] = entry.split(" ");
+    if (action !== "Leave") {
+      nicknames[userId] = nickname;
+    }
+  });
+
+  record.forEach((entry) => {
+    const [action, userId] = entry.split(" ");
+    if (action === "Enter") {
+      result.push(`${nicknames[userId]}님이 들어왔습니다.`);
+    } else if (action === "Leave") {
+      result.push(`${nicknames[userId]}님이 나갔습니다.`);
+    }
+  });
+
+  return result;
+}