javascript singleton pattern

singleton.js

var Singleton =(function(){
  var _instance ;     
	function init(){
		return {
			method: function(){ 
				return 1;               
			}, 
		    property: 'hello'          
		}     
	}     
	return {
		getInstance: function(){ 
			!_instance && ( _instance = init() ); 
			return _instance; 
		}     
	}
})();

Singleton.getInstance().method();