nobu	2016-11-23 08:11:41 +0900 (Wed, 23 Nov 2016)

  New Revision: 56875

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56875

  Log:
    Use `&.` and `||=` instead of if guards

  Modified files:
    trunk/lib/webrick/server.rb
Index: lib/webrick/server.rb
===================================================================
--- lib/webrick/server.rb	(revision 56874)
+++ lib/webrick/server.rb	(revision 56875)
@@ -312,22 +312,16 @@ module WEBrick https://github.com/ruby/ruby/blob/trunk/lib/webrick/server.rb#L312
     # Calls the callback +callback_name+ from the configuration with +args+
 
     def call_callback(callback_name, *args)
-      if cb = @config[callback_name]
-        cb.call(*args)
-      end
+      @config[callback_name]&.call(*args)
     end
 
     def setup_shutdown_pipe
-      if !@shutdown_pipe
-        @shutdown_pipe = IO.pipe
-      end
-      @shutdown_pipe
+      return @shutdown_pipe ||= IO.pipe
     end
 
     def cleanup_shutdown_pipe(shutdown_pipe)
       @shutdown_pipe = nil
-      return if !shutdown_pipe
-      shutdown_pipe.each(&:close)
+      shutdown_pipe&.each(&:close)
     end
 
     def alarm_shutdown_pipe

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