回答編集履歴
1
追記
answer
CHANGED
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@@ -7,4 +7,10 @@
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7
7
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end
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8
8
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list
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9
9
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end
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10
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+
```
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11
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+
解2
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12
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+
```
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13
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+
def list_of_domains(domain)
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14
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(dom=domain.split('.')).inject([domain]){|ary,_d| dom.shift;ary<<dom.join(".")}
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15
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end
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10
16
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```
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