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  1. function chatSystem(){
  2.  
  3.     let user = new Map();
  4.     let onlineUsers = new Set();
  5.  
  6.     function login(id){
  7.         if (!onlineUsers.has(id)){
  8.            onlineUsers.add(id);
  9.            user.set(id,(user.get(id) || 0) + 1 )
  10.         }
  11.     }
  12.     function logout(id){
  13.         if (onlineUsers.has(id)){
  14.             onlineUsers.delete(id);
  15.         }
  16.     }
  17.     function isOnline(id){
  18.         if (onlineUsers.has(id)){
  19.            return true
  20.         }else{
  21.             return false
  22.         }
  23.     }
  24.     function countOnline(){
  25.         return onlineUsers.size
  26.     }  
  27.     function countLogins(id){
  28.      return (user.get(id) || 0 )
  29.     } 
  30.     return {
  31.         login,
  32.         logout,
  33.         isOnline,
  34.         countOnline,
  35.         countLogins
  36.     }
  37. }
  38.  
  39. const myChat = chatSystem();
  40. myChat.login(1);
  41. myChat.login(3);
  42. myChat.login(2);
  43. myChat.login(4);
  44. console.log(myChat.countOnline()); 
  45. myChat.logout(1);
  46. console.log(myChat.countOnline()); 
  47. myChat.login(1);
  48. console.log(myChat.countLogins(1));  
  49. console.log(myChat.isOnline(4));
  50. console.log(myChat.isOnline(1)); 
  51. myChat.logout(2);
  52. console.log(myChat.isOnline(2)); 
  53.  
Success #stdin #stdout 0.04s 16540KB
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4
3
2
true
true
false
https://ideone.com/tDoImt
language:
JavaScript (SMonkey 60.2.3)
created:
1 day ago
visibility:
public

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