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Javascript Singleton Pattern

/ Published in: JavaScript
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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 exist. In the event of an instance already existing, it simply returns a reference to that object.

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  1. var Singleton = (function () {
  2.   var instantiated;
  3.   function init() {
  4.     // singleton here
  5.     return {
  6.       publicMethod: function () {
  7.         console.log('hello world');
  8.       },
  9.       publicProperty: 'test'
  10.     };
  11.   }
  12.   return {
  13.     getInstance: function () {
  14.       if (!instantiated) {
  15.         instantiated = init();
  16.       }
  17.       return instantiated;
  18.     }
  19.   };
  20. })();
  21.  
  22. // calling public methods is then as easy as:
  23. Singleton.getInstance().publicMethod();

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