Instrument all of object's functions with fn.before() and fn.after() functions

aopJs

    //requires underscore.js 1.3+
    var wrapFunctions = function(obj){ 
        _.each(obj, function(func, funcName){
            if(_.isFunction(func)){
                obj[funcName] = _.wrap(func, function(fn){
                    var wrappedArgs = _.toArray(arguments).slice(1);
                    wrappedArgs = obj[funcName].before && obj[funcName].before.apply(this, wrappedArgs) || wrappedArgs;
                    var ret = fn.apply(obj, wrappedArgs);
                    obj[funcName].after && obj[funcName].after.apply(this, wrappedArgs);
                    return ret;
                }); 
            }
        });
        return obj;
    };