// WAY 1 - Instantiating an anonymous function
var MySingleton = new (new MyClass(args));
 
// WAY 2 - Using an instance manager
var getMySingleton = (function(options) {
	function MyClass(args) {}

	var singleton;
	return function(args) {
		return singleton ? singleton : singleton = new MyClass(args);
	}
})();
 
// WAY 3 - The simple way
var MySingleton = {
	prop: "foo",
	method: function() {},
	...
};

3 ways of implementing the Singleton pattern in JavaScript

JavaScript