回答編集履歴
1
Object.assignは破壊的メソッドなので修正
test
CHANGED
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@@ -4,7 +4,7 @@
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4
4
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5
5
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```js
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6
6
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7
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-
shops.map(shop => shopIds.includes(shop.id) ?
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7
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+
shops.map(shop => shopIds.includes(shop.id) ? {...shop, isOpen: false} : shop);
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8
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```
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10
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