Debugging a JS app with Aspect Oriented Programming

applyDebug.js

function applyDebug(obj) {
    for (var f in obj) {
        if (obj.hasOwnProperty(f) && typeof obj[f] === 'function') {

            console.log(obj[f].toString());

            origFunc = obj[f];
            obj[f] = function () {
                console.debug("called at " + new Date());
                return origFunc.apply(this, arguments);
            }
        }
    }
}

var Person = function() {
    this.foo = "bar",
    this.bar = function() {
        return "baz";
    }
};

var p = new Person;
applyDebug(p);