13.3. BasicObject as ancestor and class
BasicObject sits at the top of Ruby’s class tree. For any Ruby object obj, the following is true:
obj.class.ancestors.last == BasicObject
In other words, the highest-up ancestor of every class is BasicObject. (Unless you mix a module into BasicObject—but that’s a far-fetched scenario.)
As you’ll recall from chapter 3, instances of BasicObject have few methods—just a survival kit, so to speak, so they can participate in object-related activities. You’ll find it difficult to get a BasicObject instance to tell you what it can do:
>> BasicObject.new.methods.sort NoMethodError: undefined method `methods' for #<BasicObject:0x007fafa308b0d8>
But BasicObject is a class and behaves like one. You can get information ...