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The scope of the getInstance() function is Window. Therefore this.singletonInstance is actually Window.singletonInstance aka a super global. (This can be easily verified with Firebug.)

Applying this implementation to multiple classes will result in all classes returning the same object!

And it is a lazy loading type. Very nice.

function Cats(){
var names = [],
proto = arguments.callee.prototype;
if (!proto._initiated){
proto.add = function(name) {
names.push(name);
return this.names();
};
proto.names = function() {
return names;
};
proto._initiated = true;
}
return this;
}

This doesn’t do much:

var foo = new Cats();
var bar = new Cats();

foo.add(“Joe”);
bar.add(“Bert”);

foo.names() // => ["Joe"]

Cheers.