如何在JavaScript中使用關聯數組來檢索用戶？

Question

目標是列出房間中的用戶，因此一個房間可以包含許多用戶，並且應該易於檢索：

例如：

user1 = {"username":"john","sex":"male"};
user2 = {"username":"robert","sex":"male"};
user3 = {"username":"isac","sex":"male"};

rooms["room1"].push(user1);
rooms["room1"].push(user2);
rooms["room2"].push(user3);

接着

return rooms["room1"];

應該回來

{"username":"john","sex":"male"};
{"username":"robert","sex":"male"};

當然是rooms[roomName].push(user2); 不好

關於如何實現這一想法？

Answer 1

var roomsMap = {
    room1: [],
    room2: [],
    room3: []
};

roomsMap.room1.push(user1);

或者，如果您需要密鑰是動態的：

roomsMap[roomKey].push(someUser);

編輯：

差不多了 但是，如何使roomsMap也動態化，而不僅限於room1，room2，room3？

您可以通過這種方式將新的鍵/數組動態添加到roomsMap 。

(roomsMap[roomKey] = roomsMap[roomKey] || []).push(user1);

完整的例子：

var roomsMap = {},
    user1 = {"username":"john","sex":"male"},
    roomKey = 'room1';

(roomsMap[roomKey] = roomsMap[roomKey] || []).push(user1);

console.log(roomsMap[roomKey]); //[Object { username="john", sex="male"}]