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March 30, 2017 12:03
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コメントとnil
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| // はコメント | |
| /* は複数行に | |
| わたる | |
| コメント */ | |
| // 1 + 1; コメントは実行すると常に Nil （無）値が返ってくる | |
| 下記を実行 | |
| 1 + 2 // + 1 プログラムに影響しない |
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