Making decisions with if/else

The if/else statement is a cornerstone of almost every programming language. It enables code to be executed conditionally, based on the outcome of a Boolean statement.

Getting ready

If you have ever played pool, you'll know that the aim of the game (when playing standard 8-ball pool) is to pot all the balls of one type and then to pot the black ball. When using American pool balls, they are numbered 1-15, and have a different pattern depending on their type. Balls 1-7 have a solid color, balls 9-15 are white with a colored stripe around them, and ball 8 is black.

Let's write a function that will take the number on the pool ball and return to us the type of ball it is.

How to do it...

Let's take a look at these steps to write this function, and then we will review how it works:

1. First, let's create enum to describe the possible types:

enum PoolBallType { 
    case solid 
    case stripe 
    case black 
} 

2. Next, we'll create the method that will take an Int and return...