From: ssmoot@...
Date: 2006-01-25T00:38:23+09:00
Subject: "self.class" vs. "(class << self; self; end)"

Is there any difference between these?

def test1()
  msg = 'bar'
  self.class.class_eval do
    define_method('foo') { msg }
  end
end

def test2
  msg = 'baz'
  (class << self; self; end).class_eval do
    define_method('foo') { msg }
  end
end

test1
puts foo

test2
puts foo

As far as I can tell, no?

If that's the case, is there any reason the second form seems so much
more common?