From: Drew Olson <olsonas@...>
Date: 2007-06-19T06:17:36+09:00
Subject: Re: Another Easy Beginner Question

Eric I. wrote:
> puts (1..12).inject(0) { |sum, day|
>   sum + (1..day).inject { |day_sum, gifts| day_sum + gifts }
> }

I'd do it as shown below, but it's probably not covered by the point in 
the book you're currently at:

irb(main):001:0> class Integer
irb(main):002:1>   def int_sum
irb(main):003:2>     (1..self).inject(0){|sum,n|sum+n}
irb(main):004:2>   end
irb(main):005:1> end
=> nil
irb(main):006:0> puts (1..12).inject(0){|sum,n|sum+n.int_sum}
364
=> nil

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