Arrayどうしを足し合わせてから uniq メソッドを呼び出すような機会はけっこう多いです。
pry(main)> ([1, 2, 3, 1] + [0, 2, 1, 1]).uniq
=> [1, 2, 3, 0]
同じことは | でもできます。
pry(main)> [1, 2, 3, 1] | [0, 2, 1, 1]
=> [1, 2, 3, 0]
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