There used to be a popular type of pulp book for younger readers. They were called "Choose Your Own Adventure" novels. The idea
was pretty simple. You'd start reading and then a few pages into the book, there would be a plot development that required a choice. The book might describe that you've entered a spooky house and the door has locked behind you. It would then ask you if you want to try to exit by going through the kitchen or exploring upstairs. If you chose to go into the kitchen, you'd turn to page 200, if you chose to go upstairs, you'd turn to page 43. This would repeat maybe five or six times though the book. You could re-read it a few times and try different outcomes. In this lab you are going to create a choose your own adventure application using navigation controllers. The introduction screen to your application will contain a few lines of text to set up a story and then leave the user with a choice. Below the text, you will present two buttons that correspond to the different choices. For example, you might see the following text on the main screen: You are walking down the street when a tiger runs up and takes your lunch and then runs away... Do you want to chase the tiger or run away
Simply put: A callback is a function that is to be executed after another function has finished executing — hence the name 'call back'. ... Functions that do this are called higher-order functions. Any function that is passed as an argument is called a callback function.
