From: Hans Mackowiak <lists@...>
Date: 2013-02-25T00:36:43+09:00
Subject: Re: How should I print only the last combination when using Array#combination(n) ?

a.combination(2).reverse_each.first #=> [2, 3]
a[-2..-1] #=> [2, 3]

with block:
a.combination(2).find {|x,y| x == 2 } #=> [2, 3]

with block and index:
a.combination(2).find.with_index {|(x,y),i| i == 2 } #=> [2, 3]

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