I have been using for a while the “new new Class” syntax to create singletons on the projects I am working on. This is for many reasons, but specially because I didn’t like other solutions like Class.Mutators, Class.Oclude or extending a plain object with $extend().

Now, after discussing a little bit on the Mootools email list about what was the best way to create singletons, I have created Class.Singleton so we can create singletons the Mootools way. Here is how it works:

var MySingleton = new Class.Singleton({
    initialize: function(){
        // code here
    },
    method1: function(){
        // code here
    },
    method2: function(){
        // code here
    }
});

Using inheritance, mixins, etc

Class.Singleton works like defining any other Mootools class using Class(), so we can have inheritance, mixins, etc.

var BaseClass = new Class({
    initialize: function() {
        // Initialization code here
        console.log('BaseClass initialized.');
    },
    method1: function() {
        // some code
    }
});

var MySingleton = new Class.Singleton({
    Extends: BaseClass,
    initialize: function() {
        this.parent();
        console.log('MySingleton singleton initialized.');
    },
    method1: function() {
        this.parent();
        // more code
    }
});

Hope you like it!

Repository url: http://github.com/eneko/Class.Singleton