log args

wrap.js

/* A function that give the first argument to the callback function */
function wrapper(func) {
  return function(arg1, callback) {
    func(arg1, function() {
      callback(arg1);
    }); 
  };  
}

function bar(arg1) {
    console.log("Bar: " + arg1);
};
function foo(arg1, callback) {
    console.log("Foo: " + arg1);
    callback();
};

// Test the wrapper
var fooImproved = wrapper(foo);
fooImproved("Hello", bar);

/* Now lets add logging for all arguments */
function addArgLogging(func) {
  return function() {
    for(var i = 0; i < arguments.length; i++) {
      // If your arguments contains more then strings
      // Say functions then you should add a check for that
      // here
      console.info("ARG " + i + ": " + arguments[i]); 
    }   
    func.apply(this, arguments)
  };  
}

// Test the Arg logger
var barLogged = addArgLogging(bar);
barLogged("Test", "Hello", "World", "Hey!");