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  1. function Chat() {
  2.   let mpon = new Map();
  3.   let mpc = new Map();
  4.   let login = function(id) {
  5.     if(mpon.has(id)===false) {
  6.       mpon.set(id,true);
  7.       mpc.set(id,0);
  8.     }
  9.     else {
  10.       let count=mpc.get(id);
  11.       mpc.delete(id);
  12.       mpc.set(id,++count);
  13.     }
  14.   }
  15.   let logout = function(id) {
  16.     if(mpon.has(id)===true) {
  17.       mpon.delete(id,true);
  18.     }
  19.   }
  20.   let isOnline = function(id) {
  21.     if(mpon.has(id)===true) {
  22.       return true;
  23.     }
  24.     else {
  25.       return false;
  26.     }
  27.   }
  28.   let countOnline = function(id) {
  29.     return mpon.size;
  30.   }
  31.   let countLogins = function(id) {
  32.     if(mpc.has(id)===false) {
  33.       return 0;
  34.     }
  35.     else {
  36.       return mpc.get(id);
  37.     }
  38.   }
  39.   return {
  40.     login,
  41.     logout,
  42.     isOnline,
  43.     countOnline,
  44.     countLogins
  45.   }
  46. }
  47.  
  48. const myChat = Chat();
  49. myChat.login(3);
  50. myChat.login(2);
  51. myChat.logout(3);
  52. console.log(myChat.countOnline()); // 1
Success #stdin #stdout 0.03s 16516KB
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1
https://ideone.com/1ANZu3
language:
JavaScript (SMonkey 60.2.3)
created:
15 days ago
visibility:
public

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