#配列同士での比較
rubyで配列1と配列2を付き合わせて同じ値が入っているかどうかを調べる時
array1 = [1,2,3,4,5]
array2 = [5,6,7,8,9]
(array1 & array2).present?
これでtrueが返ってくる。
#参考記事
https://qiita.com/tomomomo1217/items/c8a2db5bbcdccdb20690
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