回答編集履歴
1
リファクタリング
answer
CHANGED
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@@ -27,7 +27,7 @@
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27
27
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}
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28
28
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29
29
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class _MyHomePageState extends State<MyHomePage> {
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30
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-
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30
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+
final _listItems = List<int>.generate(30, (_) => 0);
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31
31
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32
32
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@override
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33
33
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Widget build(BuildContext context) {
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