ruby列表祖先不是mixins

Question

最好用代码解释....

>> String.ancestors
=> [String, Comparable, Object, Kernel, BasicObject]
>> Comparable.ancestors
=> [Comparable]
>> Object.ancestors
=> [Object, Kernel, BasicObject]
>> Kernel.ancestors
=> [Kernel]
>> BasicObject.ancestors
=> [BasicObject]

所以我怀疑继承链是String＆lt;对象＆lt; BasicObject ...和Comparable和Kernel是mixins ...

是否有功能＆＃39; foobar＆＃39;哪个可以显示继承：

>> String.foobar
=> [Object, BasicObject]

如果可能的话，还包括存储单例方法的隐藏元类？

Answer 1

String.ancestors.grep(Class)

......................

Answer 2

你可以这样做：

class Class
  def foobar
    ancestors - included_modules - [self]
  end
end