From: Hans Mackowiak <lists@...>
Date: 2013-06-25T16:44:41+09:00
Subject: Re: Sum method through while loops or iteration

"Jesús Gabriel y Galán" <jgabrielygalan@gmail.com> wrote in post 
#1113505:

> 2.- More functional styles:
>
> 2.0.0p195 :029 > a.inject(0) {|total, x| total + x}
>  => 10
> 2.0.0p195 :030 > a.inject(:+)
>  => 10
>

there is a difference:

[].inject(0) {|total, x| total + x}
  => 0
[].inject(:+)
 => nil

so i think this would be the best:

[].inject(0,:+)
 => 0

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