回答編集履歴
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訂正
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@@ -5,9 +5,9 @@
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必要なさそうなら、ダイレクトにMapを作っても良いかもしれません。
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```javascript
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-
var goal = start.reduce( (map, [key,
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var goal = start.reduce( (map, [key, expenseTitle, ...others]) => (
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map.has(key)
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? map.get(key).
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? map.get(key).arrays.push(others)
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: map.set(key, {expenseTitle
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: map.set(key, {expenseTitle,arrays:[others]})
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, map), new Map);
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```
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