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shinokada/amidakuji.rb

Last active August 29, 2015 14:00
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Swap two items in an array
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amidakuji.rb
a = [1, 2, 3, 4]
(0...arr.length - 1).map{|i| arr.dup.tap{ |a| a[i, 2] = a[i, 2].reverse } }
# => [[2, 1, 3, 4, 5], [1, 3, 2, 4, 5], [1, 2, 4, 3, 5], [1, 2, 3, 5, 4]]
a = [1, 2, 3]
# => [1, 2, 3]
(0...a.length - 1).map{|i| a.dup.tap{|a| a[i, 2] = a[i, 2].reverse}}
# => [[2, 1, 3], [1, 3, 2]]
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