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a guest Apr 16th, 2018 48 Never
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  1. function Stopwatch () {
  2.     var startTime = 0;
  3.     var endTime = 0;
  4.     var running = 0;
  5.     var duration = 0;
  6.  
  7.     this.start = function() {
  8.         if (running) {
  9.             throw new Error('Stopwatch has alredy started');
  10.         }
  11.  
  12.         startTime = new Date();
  13.         running = true;
  14.     };
  15.  
  16.     this.stop = function() {
  17.         if (!running) {
  18.             throw new Error('Stopwatch is not started');
  19.         }
  20.  
  21.         endTime = new Date();
  22.         running = false;
  23.         duration = endTime.getTime() - startTime.getTime();
  24.         this.duration = duration / 1000;
  25.     };
  26.  
  27.     this.reset = function() {
  28.         startTime = 0;
  29.         endTime = 0;
  30.         running = 0;
  31.         duration = 0;
  32.         this.duration = 0;
  33.     };
  34.    
  35.     Object.defineProperty(this, 'duration', {
  36.         get: function() {
  37.             return duration;
  38.         },
  39.        
  40.         set: function(val) {
  41.             duration = val;
  42.         }
  43.     })
  44. }
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