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「偽を返す」と書かれていると、
defined?
が ? で終わるキーワードなので Ruby の慣習として false を返すと勘違いしやすいと思ったため、「nil を返す」と明確に書くよう修正しました。同じページ内の
alias
とundef
の説明で「nil を返します」と書かれているため、それら一貫させるためにもdefined?
の説明も「nil を返す」と明確に書くのがよいと思いました。