"Switch" in the Swift Programming: The Big Nerd Ranch Guide (2nd Ed.) e-book: You can add more conditions to the if-case by supplying a comma-separated list. For example, you could check to see whether the person is: a) in the cool demographic, b) of drinking age in the United States, and c) not in their thirties. Add another condition to Listing 5.13 to check whether age meets all of these conditions.