It is possible for a class to be used in the style of a method.
Here's an example:
total_sum = class SimpleSum sum_of_two_numbers = 7 + 3 sum_of_two_numbers end puts total_sum puts SimpleSum.superclass
PS C:\Temp\irb> ruby .\simplesum.rb 10 Object PS C:\Temp\irb>
It is very unlikely that you will need to classes in this way in real life. But it is possible if you need to.