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    sets:fold(fun (Id, ok) ->
                      supervisor:terminate_child(?MODULE, Id),
                      supervisor:delete_child(?MODULE, Id),
                      ok
              end, ok, Kill),

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    Port = case os:getenv("WEBMACHINE_PORT") of
            false -> 8000;
            AnyPort -> AnyPort
          end,

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NEW POLICY THIS YEAR: If you are registered for DCamp, do not cancel your registration within two weeks of the event, and are a no-show for the event, you will not be permitted to attend for another two years.  This policy has been put in place for all of the reasons described below.

---

Every year, we have a few cancellations.  And we also have no-shows.

DCamp is free ("as in beer") for the community and paid for 100% by sponsors.  We're a fairly small event, all in all, of just 78 people. As participants, we define the event for one another.

If you're a no-show then the event is  weaker for it.  That's one less person contributing to DCamp sessions, enriching the community.  And it's one less person using the services and supplies paid for by the sponsors.

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  1) Authentication A user, once registered, is authenticated                                                                                                                                                                  
     Failure/Error: click_button "Register"                                                                                                                                                                                    
     ArgumentError:                                                                                                                                                                                                            
       wrong number of arguments (2 for 1)                                                                                                                                                                                     
     # ./spec/features/auth_spec.rb:9:in `block (2 levels) in <top (required)>'  

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# Code of Conduct

## Front matter                                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                    
I am proud to say that, while I have asked repeatedly over the years, I have never heard of a single incident where a participant has harassed another.                                                                                                                                                            
                                                                               

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; defpage is one of a few different macros generated and used by the Grinder
(defpage page1
  ; Code to invoke http requests using its internal HTTPConnection class
   ... )
(defpage page2 ...)
(defpage page3 ...)

(defn run []
  (page1)
  (page2)

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FP_OO Chapter 10.9 Exercise Prerequisites:
 
1. Install leinengen
 
  I hope you're using this already to run your repl...
 
2. lein new playground
 
  This will create you a directory called playground
 

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class User
  after_save do
    if name_changed?
      notify_listeners(:name, self)
    end
  end

  def self.register_listener(listener)
    # ...
  end

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class User
  def name=(value)
    @name = value
  end
end

class ClientProxy
  def push_change_to_client(message, source)
    # ...
  end

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module Resque
  def self.hook_responders
    @hook_responders ||= [self]
    @hook_responders
  end

  def self.register_hook_responder(responder)
    hook_responsers << responder
  end