classify.js

// Turns any function into a constructor that will work
// with or without the 'new' keyword. The returned function
// shares its prototype with the source function for
// transparency.

Function.prototype.toClass = function() {
    var func = this, bridge = function() {};
    bridge.prototype = func.prototype;

    var make = function(args) {
        var object = new bridge;
        func.apply(object, args);
        return object;
    };

    var factory = function() {
        return make(arguments);
    };
    factory.prototype = func.prototype;

    return factory;
};