196

Yup :) Everything in Ruby inherits Object, too. It's a really neat language, and when you get accustomed to it, you might wonder why some other languages aren't written like it.

For the 0 value being truthy, consider that Ruby is a dynamic language. Imagine if you asked a user how many motorcycles they own. If they answer, you'll have an Integer. If they don't, you'll have nil, from NilClass. 0 is just as valid of an answer as 2, so you can do something like this:

raise NoResponse unless motorcycles

save_motorcycles(motorcycles)