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  1. When you create an instance of a class, Ruby creates a hidden class, basically a copy of the original class, but which is owned exclusively by this instance. This is the Eigenclass. If you modify the Eigenclass of your first instance, it won't change anything for another instance.
    dev.to/samuelfaure/explaining-ruby-s-singleton-class-eigenclass-to-confused-beginners-cep
    dev.to/samuelfaure/explaining-ruby-s-singleton-class-eigenclass-to-confused-be…
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    Well, this makes sense as (almost) everything in Ruby is an object. What you commonly call a class method is, behind the scene, an instance method of the eigenclass. By the way, the eigenclass is also referred as singleton class. Ok... But what exactly is the eigenclass? First, we define a Greeting.eigenclass method.
    medium.com/rubycademy/understanding-the-eigenclass-i…
    When you create an instance of a class, Ruby creates a hidden class, basically a copy of the original class, but which is owned exclusively by this instance. This is the Eigenclass. If you modify the Eigenclass of your first instance, it won't change anything for another instance.
    dev.to/samuelfaure/explaining-ruby-s-singleton-class-eig…
    In Ruby there really are no such things as class methods. Since everything is an object in Ruby (including classes), when you say def self.class_method, you are just really defining a singleton method on the instance of the class Class. So to answer your question, saying
    stackoverflow.com/questions/4217019/ruby-class-method…
    Here's the bit of information I had the most trouble to find: the Eigenclass is called the Singleton class because it is a Class that follows the Singleton pattern. The Singleton pattern is simply an object-oriented programming pattern where you make sure to have 1 and only 1 instance of some class.
    dev.to/samuelfaure/explaining-ruby-s-singleton-class-eig…
  3. Understanding the Eigenclass in less than 5 minutes - Medium

  4. Explaining Ruby's Singleton Class (Eigenclass) to confused beginners

  5. ruby - Why isn't the eigenclass equivalent to self.class, when it …

    Code sample

    def eigen
      class << self
        self
      end
    end...
  6. Understanding the Eigenclass in less than 5 minutes

  7. class << self and Eigenclass

  8. File: README — Documentation for eigenclass (2.0.4)

  9. Ruby’s Anonymous Eigenclass: Putting the “Ei” in Team

    WEB6 Jul 2017 · Coming from the german word eigen, meaning ‘own’, the Eigenclass is a metaclass within Ruby. We can take it to literally mean ‘the class unto itself.’ Whoooah, meta! Scary, right? Nah.

  10. GitHub - shuber/eigenclass: Eigenclasses (metaclasses) in Ruby

  11. Singleton Methods and the Eigenclass - The Ruby Programming …

  12. Explaining Ruby's Singleton Class (Eigenclass) to confused beginners ...