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function tellMeWhen(callback) {
  // you can do stuff here and will be executed every time, 
  // BEFORE the console.logs below
  // but callback() will execute the below functions 
  callback();
}

tellMeWhen(function(){
  console.log("finish");
}) ;

tellMeWhen(function(){
  console.log('all over her');
});

// => finish
// => all over her

// run the initial function
function greet(callback) {
	console.log('Hey!');
  // you can include objects in your callback
	var data = {
		name: 'Piper'
	};
  // then run a callback to run the callback function
  // which will add the callback functions as parameters on the main function 
	callback(data);
}

// is run after the initial function is run the first time
greet(function(data) {
	console.log('Callback function 1 was invoked!');
  // get the whole data object
  console.log(data); // => { name: 'Piper' }
});

// callback function 2
// run after the initial function is run the second time
greet(function(data) {
	console.log('Callback function 2 was invoked!');
  // get only the data object name property
	console.log(data.name); // => Piper
});