From: Love U Ruby <lists@...>
Date: 2013-02-24T23:55:12+09:00
Subject: How should I print only the last combination when using Array#combination(n) ?

>> a = [1,2,3]
=> [1, 2, 3]

>> a.combination(2)
=> #<Enumerator: [1, 2, 3]:combination(2)>

>> a.combination(2).to_a
=> [[1, 2], [1, 3], [2, 3]]

>> a.combination(2){|arr| print arr.length;print "~~>";print arr;print"=>";p arr}
2~~>[1, 2]=>[1, 2]
2~~>[1, 3]=>[1, 3]
2~~>[2, 3]=>[2, 3]
=> [1, 2, 3]

Any chance to get only the last combination,i.e [[2,3]] or 2~~>[2,
3]=>[2, 3] ?

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