回答編集履歴
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コード追加
answer
CHANGED
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@@ -1,2 +1,37 @@
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1
1
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これと同じ？
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2
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-
https://teratail.com/questions/234337
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2
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+
https://teratail.com/questions/234337
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3
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+
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4
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こんな感じ？
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5
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+
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6
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```javascript
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7
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const data = [
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8
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[NaN, NaN, NaN, NaN],
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9
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[1, 2, 3, 4],
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10
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[1, 2, 3, 4],
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11
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[1, 2, 3, 4],
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12
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[5, 6, 7, 8],
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13
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[5, 6, 7, 8],
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14
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[5, 6, 7, 8],
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15
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[9, 10, 11, 12],
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16
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[9, 10, 11, 12],
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17
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[9, 10, 11, 12],
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18
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];
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19
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const split = (array, n) => array.reduce(
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20
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(a, c, i) => i == 0 ? [c]
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: i % n == 1 ? [...a, [...c]]
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: [...a.slice(0, -1), a[a.length - 1].map((v, i) => v + c[i])],
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23
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[]);
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24
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const result = split(data, 3);
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25
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console.log(result)
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26
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```
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27
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28
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実行結果
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29
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30
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```
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31
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[
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32
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[ NaN, NaN, NaN, NaN ],
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33
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[ 3, 6, 9, 12 ],
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34
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[ 15, 18, 21, 24 ],
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35
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[ 27, 30, 33, 36 ]
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36
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]
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37
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```
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