gouf/memo.md

Last active April 1, 2016 08:03

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重複した項目を検出する

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memo.md

a = ["A", "B", "C", "B", "A"]
a.detect{ |e| a.count(e) > 1 } # => ['A', 'B']

Link

Ruby: How to find and return a duplicate value in array? - stackoverflow

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