singleton implementation in JavaScript

singleton_js

var app = function() {
  //Private stuff
  var instance;
  
  //Init method just like a constructor
  function init() {
    //Return an empty object
    reutn {};
  }
  
  //Public
  return {
    getInstance: function() {
      if(!instance)
        instance = init();
      return instance;
    },
    destory: function() {
      instance = null;
    }
  };
};