回答編集履歴
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追記
test
CHANGED
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@@ -17,3 +17,15 @@
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end
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```
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解2
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```
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def list_of_domains(domain)
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(dom=domain.split('.')).inject([domain]){|ary,_d| dom.shift;ary<<dom.join(".")}
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end
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```
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