JavaScript style for optional callbacks

Question

I have some functions which occasionally (not always) will receive a callback and run it. Is checking if the callback is defined/function a good style or is there a better w

Answer 1

It can easilly be done with ArgueJS:

function save (){
  arguments = __({callback: [Function]})
.....do stuff......
  if(arguments.callback){
    callback();
  };
};