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pegumaru

@peco4107

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swiftを学習中

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クロージャ

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クロージャ

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Swiftの標準入力、入力値のアンラップ

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アップキャスト、ダウンキャスト

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Optional型の目的とラップ/アンラップ

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undefined method `name' for nil:NilClassの原因と解決策

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undefined method `name' for nil:NilClassの原因と解決策

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Failed to load resource: the server responded with a status of 404 (Not Found)の原因と解決策

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クラス、インスタンスとは？