It's comforting to think that, in the code you write, everything will always happen as expected, and your program can handle any eventuality. However, sometimes things can go wrong, really wrong; a situation can arise that you know is possible, but don't expect to ever happen, and the programs should terminate if it does. Swift has a way to define these situations, and in this recipe, we will look at two of them: fatalError and precondition.
Bailing out with fatalError and precondition
Getting ready
Let's reuse our example from the previous recipe; we have an object that can be used to classify movie reviews based on how many stars out of ten the review gave the movie. However, let's simplify its use, and...
