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Javascript Static Singleton Pattern

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In conventional software engineering, the singleton pattern can be implemented by
creating a class with a method that creates a new instance of the class if one doesn't In conventional software engineering, the singleton pattern can be implemented by creating a class with a method that creates a new instance of the class if one doesn't

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  1. var SingletonTester = (function () {
  2.   // options: an object containing configuration options for the singleton
  3.   // e.g var options = { name: 'test', pointX: 5};
  4.   function Singleton(options) {
  5.     // set options to the options supplied or an empty object if none provided.
  6.     options = options || {};
  7.     //set the name parameter
  8.     this.name = 'SingletonTester';
  9.     //set the value of pointX
  10.     this.pointX = args.pointX || 6;
  11.     //set the value of pointY
  12.     this.pointY = args.pointY || 10; }
  13.  
  14.   // this is our instance holder
  15.   var instance;
  16.  
  17.   // this is an emulation of static variables and methods
  18.   var _static = {
  19.     name: 'SingletonTester',
  20.     // This is a method for getting an instance
  21.     // It returns a singleton instance of a singleton object
  22.     getInstance: function (options) {
  23.       if (instance === undefined) {
  24.         instance = new Singleton(options);
  25.       }
  26.       return instance;
  27.     }
  28.   };
  29.   return _static;
  30. })();
  31.  
  32. var singletonTest = SingletonTester.getInstance({
  33.   pointX: 5
  34. });
  35.  
  36. console.log(singletonTest.pointX); // outputs 5

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