gistfile1.txt

var AppState = function() { };

AppState.prototype = {

    updateAppState: function(updateFunction) {
        console.debug("before updating:",this);
        console.debug("before updating:",this.constructor);
        console.debug("before updating:",new this.constructor());
        console.debug("before updating:",new this.prototype.constructor());
        Preconditions.checkMandatoryParameter(updateFunction,"updateFunction is required");
        var updated = React.addons.update(this, updateFunction);
        //DeepFreeze(updated);
        return updated;
    },
}



This gives me the following when I call "new AppState().updateAppState(...)"
before updating: 
AppState {updateAppState: function, initialAppState: function, updateUserData: function, removeUserData: function, updateSelectedPane: function…}
 appState.js:17
before updating: function Object() { [native code] } appState.js:18
before updating: Object {} appState.js:19
Uncaught TypeError: Cannot read property 'constructor' of undefined