what is module extend self?

Today when I reading about rails source code found

module Dependencies
  extend self
end

Yes, I never saw this usage before, this actually is a efficient way to change all instance methods into class methods.

Reference: (http://ozmm.org/posts/singin_singletons.html)[http://ozmm.org/posts/singin_singletons.html]

Published: April 27 2012

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