質問編集履歴
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オブジェクト指向設計実践ガイドの中身について〜 attr_re
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オブジェクト指向設計実践ガイドの中身について〜 attr_readerを用いる理由
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class Gear
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attr_re
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attr_reader :chainring, :cog
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def initialize(chainring, cog)
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