[]はarrayクラスのクラスメソッドなので、以下のように書くことができる
irb(main):003> Array.[](1,2,3)
=> [1, 2, 3]
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[]はarrayクラスのクラスメソッドなので、以下のように書くことができる
irb(main):003> Array.[](1,2,3)
=> [1, 2, 3]
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