回答編集履歴
1
nullをundefinedに変更
test
CHANGED
@@ -20,9 +20,7 @@
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20
20
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21
21
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}
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22
22
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23
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-
let l = s.length;
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24
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-
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25
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-
return (l <
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23
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+
return (s.length <= 1) ? s[0] : s;
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26
24
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27
25
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};
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28
26
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