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add array#sum and #mean methods

by chrisk, 19 Jun, 2007 07:09 PM

M exercisetracker/trunk/app/controllers/application.rb view

  class ApplicationController < ActionController::Base
    helper :all # include all helpers, all the time
  end
+ class Array
+   def sum
+     inject(0) { |sum, x| sum + x }
+   end
+   def mean
+     (size > 0) ? sum.to_f / size : 0
+   end
+ end