Counting classes created with `Class.new`

class_counter.rb

#!/usr/bin/env ruby

# Don't use this in production!
module ClassCounter
  def self.extended (klass)
    $stderr.puts("Injecting hacked `new' into `#{klass}'")
    klass.instance_exec {@klass_count = 0}
  end

  def new (*)
    super.tap do |klass|
      @klass_count += 1
      $stderr.puts("New class: #{klass} count: #@klass_count")
    end
  end
end

# Override Class::new.
Class.extend(ClassCounter)

# Test it out.
something = Class.new
another   = Class.new

Awesome! 😄

one more question 😀

class Class
  alias oldNew  new
  def new(*args)
    print "Creating a new ", self.name, "\n"
    oldNew(*args)
  end
end

class Name
end

Name.new
# output: Creating a new Name

Class.new
# output: Creating a new Class

Calling Name.new will output Creating a new Name since we modify the instance method new of Class, but why the "class" method new also got effected and output Creating a new Class when I call Class.new?