From: 7stud -- <lists@...>
Date: 2012-12-26T16:34:04+09:00
Subject: Re: Accumulate total count for each month

Soichi Ishida wrote in post #1090212:
>
> Normally, when counting the number of each word occurred in a file,
> using hash can help (each word as a key).  But this case, it is not that
> simple because the key is date object.
>
> Do you have better ideas for counting the number of events each month?
>

require 'date'

date_times1 = (1..12).map do |month|
  DateTime.new(2012,month,25,4,5,6)
end

date_times2 = (1..6).map do |month|
  DateTime.new(2012,month,25,4,5,6)
end

date_times = date_times1 + date_times2

results = Hash.new {|hash, key| hash[key] = []}

date_times.each do |dt|
  results[dt.month] << dt
end

(1..12).each do |month|
  puts "month %s:" % month

  results[month].each do |event|
    puts "\t%s" % event
  end
end


--output:--
month 1:
  2012-01-25T04:05:06+00:00
  2012-01-25T04:05:06+00:00
month 2:
  2012-02-25T04:05:06+00:00
  2012-02-25T04:05:06+00:00
month 3:
  2012-03-25T04:05:06+00:00
  2012-03-25T04:05:06+00:00
month 4:
  2012-04-25T04:05:06+00:00
  2012-04-25T04:05:06+00:00
month 5:
  2012-05-25T04:05:06+00:00
  2012-05-25T04:05:06+00:00
month 6:
  2012-06-25T04:05:06+00:00
  2012-06-25T04:05:06+00:00
month 7:
  2012-07-25T04:05:06+00:00
month 8:
  2012-08-25T04:05:06+00:00
month 9:
  2012-09-25T04:05:06+00:00
month 10:
  2012-10-25T04:05:06+00:00
month 11:
  2012-11-25T04:05:06+00:00
month 12:
  2012-12-25T04:05:06+00:00

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