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  1. function Chat() {
  2.   // do your magic
  3.   let users = new Map();
  4.  
  5.   function login(id) {
  6.     if (!users.has(id)) {
  7.       users.set(id, { online: true, loginCount: 1 });
  8.     } else if (!users.get(id).online) {
  9.       users.get(id).online = true;
  10.       users.get(id).loginCount += 1;
  11.     }
  12.   }
  13.  
  14.   function logout(id) {
  15.     if (users.has(id) && users.get(id).online) users.get(id).online = false;
  16.   }
  17.  
  18.   function isOnline(id) {
  19.     return users.has(id) && users.get(id).online;
  20.   }
  21.  
  22.   function countOnline() {
  23.     let count = 0;
  24.     users.forEach((user) => {
  25.       if (user.online) count++;
  26.     });
  27.     return count;
  28.   }
  29.  
  30.   function countLogins(id) {
  31.     return users.has(id) ? users.get(id).loginCount : 0;
  32.   }
  33.  
  34.   return {
  35.     login,
  36.     logout,
  37.     isOnline,
  38.     countOnline,
  39.     countLogins,
  40.   };
  41. }
  42.  
  43. const myChat = Chat();
  44. myChat.login(3);
  45. myChat.login(2);
  46. myChat.logout(3);
  47. console.log(myChat.countOnline()); // 1
  48.  
Success #stdin #stdout 0.03s 16640KB
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1
https://ideone.com/llSJZv
language:
JavaScript (SMonkey 60.2.3)
created:
14 hours ago
visibility:
public

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