From: Todd Benson <caduceass@...>
Date: 2009-07-14T02:27:40+09:00
Subject: Re: calculating an array of dates

On Mon, Jul 13, 2009 at 10:42 AM, Eric
Peterson<peterson_eric_d@hotmail.com> wrote:
> Siep Korteling wrote:
> <snip>
>>
>> I have not looked into the reasons why your code doesn't work, just took
>> your post as a coding exercise. My try looks like this:
>>
>> require 'Date'
>> class Date
>>   def thursdays_upto_now
>>      end_date = Date.today
>>      res = []
>>      # get the last thursday:
>>      end_date -= 1 while (end_date.wday != 4)
>>      end_date.step(self, -7) do |date|
>>        res << date
>>      end
>>      res
>>    end
>>  end
>>
>> start_date = Date.parse( 'Thu Jun 11 13:14:44 -0700 2009' )
>> start_date.thursdays_upto_now.each{|thursday| puts thursday.to_s} # or
>> whatever
>>
>> I was happy finding out Date has a step method.
>>
>> hth, I had some fun,
>>
>> Siep
>
>
> much better then my final code.  I guess my mind is still stuck in
> FORTRAN method of coding.  I'm finding Ruby very nice and interesting.
> Lots of new tricks to learn.
...

today = Date.today
puts( today + 4 - today.wday)

...no need for the while with the -=.  In fact won't the -= always
give you the previous Thursday?  The #step I didn't know about.  Good
advice.

I didn't test the above code, but I'm pretty sure it will work for all
edge cases.

Todd