getclass.js

var getClass = function() {
    var funcNameRegex = /function (.{1,})\(/;
    var results = (funcNameRegex).exec((this).constructor.toString());
    return (results && results.length > 1) ? results[1] : "";
};

// define a class
function Animal() {}

// do this for all classes that need the getClass() method
Animal.prototype.getClass = getClass;

myDog = new Animal();
assert(myDog.getClass() == 'Animal');