Posted By

timsommer on 07/30/12

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javascript

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Last Edited at 07/30/12 09:52pm

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Javascript Static Singleton Pattern

/ Published in: JavaScript

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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// this is our instance holder
  var instance;

// this is an emulation of static variables and methods
  var _static = {
    name: 'SingletonTester',
    // This is a method for getting an instance
    // It returns a singleton instance of a singleton object
    getInstance: function (options) {
      if (instance === undefined) {
        instance = new Singleton(options);
      }
      return instance;
    }
  };
  return _static;
})();

var singletonTest = SingletonTester.getInstance({
  pointX: 5
});

console.log(singletonTest.pointX); // outputs 5

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