From: "Peña, Botp" <botp@...>
Date: 2008-09-26T19:04:55+09:00
Subject: Re: [SUMMARY] One-Liners Mashup (#177)

From: Matthew Moss [mailto:matthew.moss@gmail.com] 
#...
#     def prog_sum(ary)
#       ary.inject([0, []]) {|(s, a), i| [s+i, a<<(s+i)]}.last
#     end

non-inject:

  prev=0; ary.map{|x| prev+=x}