eigenclass – Tarik Billa

Why isn’t the eigenclass equivalent to self.class, when it looks so similar?

January 28, 2023 by Tarik

class << self is more than just a way of declaring class methods (though it can be used that way). Probably you’ve seen some usage like: class Foo class << self def a print “I could also have been defined as def Foo.a.” end end end This works, and is equivalent to def Foo.a, but … Read more

class

September 5, 2022 by Tarik

First, the class << foo syntax opens up foo‘s singleton class (eigenclass). This allows you to specialise the behaviour of methods called on that specific object. a=”foo” class << a def inspect ‘”bar”‘ end end a.inspect # => “bar” a=”foo” # new object, new singleton class a.inspect # => “foo” Now, to answer the question: … Read more