This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.

Finding the Class and Superclass of an Object
CodeExpectedActual
'a string'.class
 String String 
'a string'.class.name
 "String" "String" 
'a string'.class.superclass
 Object Object 
String.superclass
 Object Object 
String.class
 Class Class 
String.class.superclass
 Module Module 
'a string'.class.new
 "" "" 
class Class
  def hierarchy
    (superclass ? superclass.hierarchy : []) << self
  end
end
Array.hierarchy
 [Object, Array] [Object, Array] 
class MyArray < Array
end
MyArray.hierarchy
 [Object, Array, MyArray] [Object, Array, MyArray] 
String.superclass
 Object Object 
String.ancestors
 [String, Enumerable, Comparable, Object, Kernel] [String, Enumerable, Comparable, Object, Kernel] 
Array.ancestors
 [Array, Enumerable, Object, Kernel] [Array, Enumerable, Object, Kernel] 
MyArray.ancestors
 [MyArray, Array, Enumerable, Object, Kernel] [MyArray, Array, Enumerable, Object, Kernel] 
Object.ancestors
 [Object, Kernel] [Object, Kernel] 
class MyClass
end
MyClass.ancestors
 [MyClass, Object, Kernel] [MyClass, Object, Kernel]