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  1. function Chat() {
  2.   const onlineStatus = new Map();
  3.   const loginCounts = new Map();
  4.   let onlineCount = 0;
  5.  
  6.   function login(id) {
  7.     if (!onlineStatus.has(id) || !onlineStatus.get(id)) {
  8.         onlineStatus.set(id, true);
  9.         onlineCount++;
  10.         if (!loginCounts.has(id)) {
  11.             loginCounts.set(id, 1);
  12.         } else {
  13.             loginCounts.set(id, loginCounts.get(id) + 1);
  14.         }
  15.     }
  16.   }
  17.  
  18.   function logout(id) {
  19.     if (onlineStatus.has(id) && onlineStatus.get(id)) {
  20.         onlineStatus.set(id, false);
  21.         onlineCount--;
  22.     }
  23.   }
  24.  
  25.   function isOnline(id) {
  26.     return onlineStatus.has(id) && onlineStatus.get(id);
  27.   }
  28.  
  29.   function countOnline() {
  30.     return onlineCount;
  31.   }
  32.  
  33.   function countLogins(id) {
  34.     return loginCounts.has(id) ? loginCounts.get(id) : 0;
  35.   }
  36.  
  37.   return {
  38.     login,
  39.     logout,
  40.     isOnline,
  41.     countOnline,
  42.     countLogins
  43.   }
  44. }
  45.  
  46. const myChat = Chat();
  47. myChat.login(3);
  48. myChat.login(2);
  49. myChat.logout(3);
  50. console.log(myChat.countOnline()); // 1
  51. console.log(myChat.countLogins(3)); // 1
  52. console.log(myChat.countLogins(2)); // 1
  53. myChat.login(3);
  54. console.log(myChat.countLogins(3)); // 2
Success #stdin #stdout 0.31s 39244KB
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https://ideone.com/aZVGSp
language:
JavaScript (rhino 1.7.9)
created:
45 days ago
visibility:
public

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