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  1. function Chat() {
  2.   let mpon = new Map();
  3.   let mpc = 0;
  4.   let login = function(id) {
  5.     if(mpon.has(id)===false) {
  6.       mpon.set(id,true);
  7.     }
  8.     mpc++;
  9.   }
  10.   let logout = function(id) {
  11.     if(mpon.has(id)===true) {
  12.       mpon.delete(id,true);
  13.     }
  14.   }
  15.   let isOnline = function(id) {
  16.     if(mpon.has(id)===true) {
  17.       return true;
  18.     }
  19.     else {
  20.       return false;
  21.     }
  22.   }
  23.   let countOnline = function(id) {
  24.     return mpon.size;
  25.   }
  26.   let countLogins = function() {
  27.     return mpc;
  28.   }
  29.   return {
  30.     login,
  31.     logout,
  32.     isOnline,
  33.     countOnline,
  34.     countLogins
  35.   }
  36. }
  37.  
  38. const myChat = Chat();
  39. myChat.login(3);
  40. myChat.login(2);
  41. myChat.logout(3);
  42. console.log(myChat.countLogins()); // 1// your code goes here
Success #stdin #stdout 0.05s 16332KB
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https://ideone.com/pfKchq
language:
JavaScript (SMonkey 60.2.3)
created:
14 days ago
visibility:
public

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