回答編集履歴
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テキスト追加
test
CHANGED
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@@ -2,8 +2,42 @@
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2
2
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3
3
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```javascript
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4
4
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5
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var numbers = [...Array(100)].map((_ ,i) => i);
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6
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7
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8
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9
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var x = 5;
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10
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5
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numbers.filter(n => `${n}`.includes(
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11
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var numbersHavingX = numbers.filter(n => `${n}`.includes(`${x}`));
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12
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14
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console.log(numbersHavingX); // => [5,15,25,35,45,50,51,52,53,54,55,56,57,58,59,65,75,85,95]
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16
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console.log(numbersHavingX.length); // => 19
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18
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19
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6
20
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21
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```
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8
22
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9
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???? [サンプル](https://codepen.io/kilesa/pen/
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23
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???? [サンプル](https://codepen.io/kilesa/pen/ZEXBVJv?editors=0012)
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24
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25
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26
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27
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28
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29
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正規表現を使うのであれば
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30
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31
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32
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33
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```javascript
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34
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35
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var x = 5;
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36
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37
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var pattern = RegExp(`${x}`);
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38
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39
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var numbersHavingX = numbers.filter(n => pattern.test(`${n}`));
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40
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41
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```
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42
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43
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???? [サンプル](https://codepen.io/kilesa/pen/GRMNPOg?editors=0012)
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