Question

Say I write this function…

var sayHi = function() {
  return "hi";
}

alert(sayHi()); will return “hi”.

Now if I write it this way…

var sayHi = function(callback) {
  callback("hi");
}

How do I display “hi” with this function?

Based on an example here: http://nowjs.com/doc

Answer 1

Try this:

sayHi(function(msg){
    alert(msg)
});

Your new sayHi function doesn’t return a value, so you have to perform the alert in the callback function.