Use def self.method to define singleton methods. ... # Also possible and conveni...

martingordon on April 6, 2012 | parent | context | favorite | on: The GitHub Styleguide

  Use def self.method to define singleton methods.
  ...
  # Also possible and convenient when you
  # have to define many singleton methods.
  class << self

I would argue against using "class << self" especially when you have many singleton methods. If the class is large enough, it's easy to miss the "class << self" and incorrectly read a class method as an instance method.

arthurschreiber on April 6, 2012 [–]

Usually you will have another level of indentation, so class methods shouldn't be that easy to mistake for instance methods.