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jschoolcraft/irb.rb

Created July 21, 2011 13:53
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irb.rb
>> dates
=> [#<Date: 2011-07-01 (4911487/2,0,2299161)>, #<Date: 2011-07-20 (4911525/2,0,2299161)>]
>> Date.today - dates.map { |d| Date.today - d }.map(&:to_f).inject { |sum, diff| sum + diff } / dates.length
=> #<Date: 2011-07-10 (2455753.0,0,2299161)>
>>
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